In the question number 60, if the lift starts moving up with a uniform speed of 5 m and the girl again throws the ball up with the same speed, how long does the ball take to return to her hands?

Question

In the question number 60, if the lift starts moving up with a uniform speed of 5 m $s^{- 1}$ and the girl again throws the ball up with the same speed, how long does the ball take to return to her hands?

Smart Achievers · Accepted Answer

(2)

When the lift starts moving upwards with uniform speed of 5 m $s^{- 1}$ , there is no change of relative velocity of ball w.r.t. girl. Hence, even in this case the ball will return to the girl's hands in the same time, i.e., 10 s.

Solution

Q.
In the question number 60, if the lift starts moving up with a uniform speed of 5 m $s^{- 1}$ and the girl again throws the ball up with the same speed, how long does the ball take to return to her hands

1 5 s

2 10 s

3 15 s

4 20 s

Ans.
(2)

When the lift starts moving upwards with uniform speed of 5 m $s^{- 1}$ , there is no change of relative velocity of ball w.r.t. girl. Hence, even in this case the ball will return to the girl's hands in the same time, i.e., 10 s.

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