Question

A ball is thrown upwards and returns to the same location. Compared with its initial speed its speed when it returns is about________________.

Answer 1

Answer:

Explanation:

Let the ball is thrown upwards with speed u and reaches upto height h.

Use III equation of motion

$v^{2}=u^{2}-2gh$

here, final velocity v = 0

So, $u = \sqrt{2gh}$

Now as the ball reaches the maximum height, it starts falling freely. Let it strkes with the ground with velocity v'.

$v'^{2}=u^{2}-2gh$

here, u = 0

So, $v' = \sqrt{2gh}$

It means the velocity is same as the velocity of projection.