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
Y_Kistochka [10]
3 years ago
11

PLEASE ANSWER!!! I WILL MARK YOU AS BRAINLIEST!!!! An object is launched straight up into the air with an initial velocity of 40

m/s, from a height 30 m above the ground. Assuming that gravity pulls it down, changing its position by about 4.9 m/s2, after how many seconds will the object hit the ground? Enter your answer as rounded to the nearest tenth, such as: 42.5
Mathematics
1 answer:
Lana71 [14]3 years ago
5 0

Answer:

6.7 seconds

Step-by-step explanation:

Let's calculate the maximum height covered by the object

Max height= U²Sin²tita/2g

Where g is acceleration due to gravity

Max height= 40²(sin90)²/(2*9.81)

Max height= 1600/19.62

Max height=81.55 m

Total max height= 30+81.55

Total max height= 111.55 m

Time t it will take to travel from the max height at acceleration of 4.9 m/s²

S= ut + ½at²

u= 0 at Mac height

S= 111.5 m

111.5 = ½(4.9)t²

223/4.9= t²

45.5= t²

6.745 seconds= t

6.7 seconds= t

You might be interested in
How do you simplify 7 (2x+10) thanks in advance
kramer
The only thing you should do is to multiply 7 by 2x and 10. 
so you will have: (7*2x) + (7*10) = 14x + 70 :)))
i hope this is helpful 
have a nice day 
5 0
3 years ago
Please help. I really need it.
Fed [463]
It’s b and d because when simplified they’re both 25/1
6 0
3 years ago
A plane took off at a point that is 42 meters from the control tower. The flight path takes the plane over the control tower tha
kodGreya [7K]

Answer:

D. The plane needs to be about 27 meters higher to clear the tower.

Step-by-step explanation:

In this scenario a triangle is being formed. The base the plane's takeoff point to the tower base which is 42 meters (x).

The hypothenus is the distance travelled by the plane which is 83 meters (h)

The height of the tower is 98 Meters

We want to calculate the height of our triangle (y) so we can guage if the plane scaled the tower.

According to Pythagorean theorem

(x^2) + (y^2) = h^2

y = √ (h^2) - (x^2)

y = √ (83^2) - (42^2)

y= √(6889 - 1764)

y= 71.59 Meters

The height from the plane's position to the top of the tower will be

Height difference = 98 - 71.59 = 26.41 Meters

So the plane should go about 27 Meters higher to clear the tower

5 0
3 years ago
Ausgtin has 1/4 as many cards as mateo. mateo has 1/2 as many cards of amaro. who has the most cards
Nataly [62]

Answer:D

Step-by-step explanation:

Amaro would have the most.

4 0
2 years ago
The student government at the local middle school surveyed students to help plan the end-of-year party. For the first sample, th
aleksandr82 [10.1K]

Answer:

Explained below.

Step-by-step explanation:

Convenience sampling is a kind of non-probability-sampling (i.e. all items doesn’t have an equivalent chance of being selected), which doesn’t comprises of random collection of items. Convenience sampling is where we take in items which are easy to reach.  This sort of sampling technique results in a biased sample.

Systematic sampling is a kind of probability sampling method in which individuals from a larger population are nominated according to a random initial point and a static, periodic interval. If the individual <em>k</em> is selected as the first sample then the sample space consists of every <em>k</em>th individual.

In this case the first sample is an example of convenience sample and the second is a systematic sample.

6 0
3 years ago
Other questions:
  • Please answer asap (don't need explanation)
    15·1 answer
  • Can a polar bear go on a safari​
    8·2 answers
  • Which two numbers add up to 5 and multiply to -84
    11·1 answer
  • If f(x) varies directly with x2 and f(x)=10 what is the value of f(x) when x=3
    11·1 answer
  • Is this answer correct?
    10·1 answer
  • Please help i really need it!! picture below!
    5·1 answer
  • 3/4 gallon= how many pints
    14·1 answer
  • Harold and his friend Bill each collect vintage action figures. Harold already has 18
    14·1 answer
  • 3x3-5/5x6+19 i don’t know what I’m don’t wrong
    10·1 answer
  • So,i have the answer to this question,but i have no clue how to work it out,ik im not that smart but anyways i need helppo
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!