1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Marysya12 [62]
3 years ago
10

A ball is launched upward at 20 meters per second (m/s) from a 60 meter tall platform. The equation for the object's height s at

time t seconds after launch is s(t) = –4.9t2 + 20t + 60, where s is in meters.
What is the height above the ground when the object is launched?
How long before the object hits the ground after launch?
What is the maximum height of the object?
Mathematics
1 answer:
Dominik [7]3 years ago
8 0

we are given

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

(a)

we can plug t=0

s(0)=-4.9(0)^2+20(0)+60

s(0)=60

so, the height above the ground when the object is launched is 60 meter......Answer

(b)

we can set s(t)=0

and then we can solve for t

s(t)=-4.9t^2+20t+60=0

-4.9t^2+20t+60=0

we can use quadratic formula

t=\frac{-200-\sqrt{200^2-4\left(-49\right)600}}{2\left(-49\right)}

we get

t=6.0917seconds..........Answer

(c)

we can find vertex

t=\frac{-20}{2*-4.9}

t=2.040816

now, we can plug it back

s(2.040816)=-4.9(2.040816)^2+20(2.040816)+60

s(2.040816)=80.408

so, the maximum height is 80.408meter.........Answer

You might be interested in
Sixty-three people participated in a study to see if they were left-brain dominant or right-brain dominant. In the study, the pe
Cloud [144]
The two-way table is attached.

We know that 63 people took the survey, and 22 of them were left-handed.  This means that 63-22=41 of them are right handed.

Out of the 63 total, 37 are left brain dominant; this means that 63-37=26 are right brain dominant.

Of the 26 that are right brain dominant, 21 are right handed; this means 26-21=5 are left handed.

Of the 22 left-handed people, 5 are right brain dominant; this means 22-5 = 17 are left brain dominant.

Of the 37 left brain dominant people, 17 are left handed; this means 37-17=20 are right handed.

8 0
3 years ago
Read 2 more answers
WRTH 50 PNTS!
andrew-mc [135]

Answer:

So, Michael completed the proof incorrectly because ∠AKG ≅ ∠AKL  are not congruent because they are not vertically opposite angles.

Step-by-step explanation:

Hope this helps! (:

4 0
2 years ago
Read 2 more answers
Which of the following expressions has a value that is less than –2?
natali 33 [55]

Answer:  A  

Step-by-step explanation: 0.25−2.50=-2.25

3 0
3 years ago
While playing volleyball , Ralph drank 3/4 of a jug of water if the jug held 64 fluid ounces of water how much did Ralph drink
Amiraneli [1.4K]

Answer:

48

Step-by-step explanation:

To find one fourth, I divided 64 by 4, which gave me 16. Then, to find 3/4, I multiplied 16*3, which is 48.

7 0
3 years ago
Read 2 more answers
Find 20% of number 85
tensa zangetsu [6.8K]

Answer: 17

Step-by-step explanation:

20. percent *85 =

(20.:100)*85 =

(20.*85):100 =

1700:100 = 17

5 0
3 years ago
Read 2 more answers
Other questions:
  • Square root of -49 in terms of i
    6·1 answer
  • mplete the work to solve for y: 2 5 ( 1 2 y + 5 ) − 4 5 = 1 2 y − 1 + 1 10 y 1.Distributive property: 1 5 y + 2 − 4 5 = 1 2 y −
    7·2 answers
  • fond two consecutive odd integers whose sum is 36 which of the following equations could be used to solve the problem
    9·1 answer
  • Question 5
    10·1 answer
  • (TIMED HELP) The population model describing the population of antelope in an area is:
    6·1 answer
  • At the local pet store, zebra fish cost $1.85 each and neon tetras cost $2.10 each. If Yumi bought 11 fish for a total cost of $
    9·1 answer
  • Can someone help me
    14·1 answer
  • Larry is buying a new video game that costs $35 plus 7% sales tax. How much will he pay for the video game with tax?
    5·1 answer
  • Khan Academy math question
    7·1 answer
  • Uma volta inteira na Terra corresponde a uma distância 2πr≅40.000 km. Se um satélite leva 85 minutos para dar uma volta completa
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!