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A boy standing on a stationary lift (ope...

A boy standing on a stationary lift (open from above) throws a ball upwards with the maximum initial speed he can, equal to `49 ms^(-1)`. How much time does the ball take to return to his hands ? If the lift starts moving up with a uniform speed of `5 ms^(-1)` and the boy again throws the ball up with the maximum speed he can, how long does the ball take to return to his hands ?

Text Solution

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10s, 10 s
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Knowledge Check

  • From the top of a tower of height 200 m, a ball A is projected up with speed of 10 ms^-1 and two seconds later, another ball B is projected vertically down with the same speed. Then: ( g =10 m/s^2 )

    A
    both A and B will reach the ground simultaneously
    B
    the ball A will hit the ground 2 seconds later than B hitting the ground
    C
    both the balls will hit the ground with the same velocity
    D
    both will rebound to the same height from the ground, if both have same coefficient of restitution

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