Question

A ball is thrown upward. After reaching a maximum height, it continues falling back toward Earth. On it way down, the ball is caught at the same height at which it was thrown upward. t hA y tB hB tA b b b b b b b b b b b b b b b b b b b b b b b b v0 O B A Neglecting air resistance, what is its speed when caught?
1. The same as its initial speed
2. Less than its initial speed
3. More than its initial speed
4. Not enough information is given.

Answer 1

Answer:

1. The same as its initial speed

Explanation:

As we know that there is no effect of air resistance

so when ball comes to its initial position we can say that there is no effect of air drag and its displacement is also zero

so we will have

$W = F.d$

$W = 0$

So work done by the gravity during its whole path must be zero here

so we will have

$W_{net} = K_f - K_i$

so here we will have

$0 = \frac{1}{2}mv_f^2 - \frac{1}{2}mv_f^2$

$v_f = v_i$

so correct answer will be

1. The same as its initial speed

Answer 2

Answer: same as esiential speed

Explanation: