A ball is projected horizontally from the top of a bertical building 25.0m above the ground level with an initial velocity of 8.

Question

3 years ago

15

25m/s . Calculate :
a. How long is the ball in flight before striking the ground
b. How far from the building does the ball strike the ground

1 answer:

kirill115 [55] · Answer 1 · 2022-09-06T12:22:06+03:00

Answer:

Solution given:

height [H]=25m

initial velocity [u]=8.25m/s

g=9.8m/s

now;

a. How long is the ball in flight before striking the ground?

Time of flight =?

Now

Time of flight= $\sqrt{\frac{2H}{g}}$

substituting value

<h3>the ball is in flight before striking the ground for 2.26seconds.</h3>

b. How far from the building does the ball strike the ground?

Horizontal range=?

we have

Horizontal range=u* $\sqrt{\frac{2H}{g}}$

<h3>The ball strikes 18.63m far from building. </h3>