All categories

2 years ago

Hello,

Mathematics

2 answers:

Nookie1986 [14]2 years ago

7 0

Answer:

s = height above ground

s = 60 + 20 t - 4.9 t^2 (standard physics equation on earth)

at t = 0

s = 60 (clearly :)

now when does it hit the bleak earth?

That is when s = 0

4.9 t^2 - 20 t -60 = 0

solve quadratic and use the positive t (the negative t was back before you threw it if you had thrown it from the ground)

t = 6.09 or - 2.01

use t = 6.09

now to do the last part there are two obvious ways to get t at the peak

1. look for vertex of parabola

2. look for halfway between t = -2.01 and t = 6.09

I will do it the hard (11) waay by completing the square

4.9 t^2 - 20 t = -(s-60)

t^2 - 4.08 t = -.204 s + 12.2

t^2 - 4.08 t +2.04^2 = -.204 s +12.2 + 4.16

(t-2.04)^2 = -.204(s-80.2)

top at 80.2 meters at t = 2.04 s

===============

quick check on time

should be average of 6.09 and -2.01

=4.08 /2 = 2.04 check

valina [46]2 years ago

4 0

Answer: I HOPE THAT MY ANSWER WILL HELP U

Step-by-step explanation:

s = height above ground

s = 60 + 20 t - 4.9 t^2 (standard physics equation on earth)

at t = 0

s = 60 (clearly :)

now when does it hit the bleak earth?

That is when s = 0

4.9 t^2 - 20 t -60 = 0

solve quadratic and use the positive t (the negative t was back before you threw it if you had thrown it from the ground)

t = 6.09 or - 2.01

use t = 6.09

now to do the last part there are two obvious ways to get t at the peak

1. look for vertex of parabola

2. look for halfway between t = -2.01 and t = 6.09

I will do it the hard (11) waay by completing the square

4.9 t^2 - 20 t = -(s-60)

t^2 - 4.08 t = -.204 s + 12.2

t^2 - 4.08 t +2.04^2 = -.204 s +12.2 + 4.16

(t-2.04)^2 = -.204(s-80.2)

top at 80.2 meters at t = 2.04 s

===============

quick check on time

should be average of 6.09 and -2.01

=4.08 /2 = 2.04 check

You might be interested in

HELP WILL NAME BRAINLIEST: <br> Describe and correct the error.

Aleksandr-060686 [28]

Answer:

It should be congruent by the AAS congruence theorem

Step-by-step explanation:

The error is in the congruence theorem.

We know that the 2 angles are congruent and one of the sides are congruent. This means that it can either be congruent by ASA or AAS.

It is actually congruent by AAS because it include two angles and the side is opposite of one of the angles.

7 0

2 years ago

Help need awnser ASAP

zzz [600]

Answer:

(B)

Step-by-step explanation:

It is given that: From ΔONP and ΔMLP,

$\frac{PO}{PL}=\frac{PN}{PM}$ (By basic proportionality theorem)

∠MPL=LPM(Common)

Therefore, ΔONP is similar to ΔMLP by SAS similarity postulate.

Also, From ΔONP and ΔKPJ,

$\frac{PO}{PK}=\frac{PN}{PJ}$ (By basic proportionality theorem)

∠OPN=KPJ(Common)

therefore, ΔONP is similar to ΔKPJ by SAS similarity postulate.

Now, since ΔONP is similar to ΔMLP by SAS similarity postulate and ΔONP is similar to ΔPJK by SAS similarity postulate, therefore ΔMLP is similar to ΔPJK by SAS similarity postulate.

Thus, all the three center triangles are similar by SSS similarity postulate.

3 0

3 years ago

A data set includes the following grades: 98, 94, 93, 82, 61, 80. Suppose that 61 is removed from the data. How is the median af

andre [41]

Answer:b

Step-by-step explanation:

A data with values

98,94,93,82,61,80 is given

If we arrange the number according to their values

61,80,82,93,94,98

Median of set

$\frac{82+93}{2}=87.5$

Now if 61 is removed then

80,82,93,94,98 are the remaining data

so New median is 93

So the median is increased by 5.5

Therefore option b is correct

5 0

3 years ago

A publisher reports that 76v% of their readers own a personal computer. A marketing executive wants to test the claim that the p

lawyer [7]

Answer:

Null Hypothesis: 'The proportion of readers who own a personal computer is not 76%'

Alternative hypothesis: 'The proportion of readers who own a personal computer is not 76%', or it could also be stated as 'The proportion of readers who own a personal computer is less than 76%'

Step-by-step explanation:

A null hypothesis is an experimental statement that negates the existence of a relationship between two phenomena that are measured, or it is a statement that tells of no association between two experimental groups. The experimenter sets out to test the null hypothesis with a bid to disprove or accept the null hypothesis after subjecting experimental results through various confidence tests.

The null hypothesis is generally accepted to be true, unless it is proven otherwise, and it always comes from the point of negation between the associated phenomena. It is denoted commonly by the symbol 'H₀'.

The null hypothesis is analogous to the statement that ' a person is assumed to be innocent, (null hypothesis is assumed to be true) unless proven guilty beyond all reasonable doubt ' (and it is rejected only if the results show a statistically significant difference between what is measured and what is stated in the null hypothesis).

When the null hypothesis is rejected, it is replaced by the alternative hypothesis, a statement that holds true to the observed result and rejects the null hypothesis.

In this example, the proposition on ground was that 76% of readers of a publication, has a personal computer, the null hypothesis comes to negate this association/claim, that it is not a 76% proportion, but it could be more or less than 76%, hence the statement 'The proportion of readers who own a personal computer is not 76%'. Upon carrying out the research, it was found that the actual value was 70%, hence the null hypothesis is not rejected, and the null hypothesis is still the alternative hypothesis which can also be stated as 'The proportion of readers who own a personal computer is less than 76%', or in the exact words of the null hypothesis.

7 0

3 years ago

You are flying from Houston to Chicago. You leave Houston at 7:30 A.M. At 8:35 A.M. you fly over Little Rock, a distance of 455

Irina18 [472]

Answer:How long does it take to fly between Little Rock, AR and Houston, TX? Get the flight duration. Use the calculator to view a map and find flying times between cities. ... Supermodel Coco Rocha back on the runway just 3 months after giving birth ... you can use DistanceCalc.com to get the distance from Little Rock to Houston.

Step-by-step explanation:

7 0

2 years ago