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A rubber ball dropped from a height of 2...

A rubber ball dropped from a height of 20m`(g=10m/s^(2))` falls on the roof of an elevator going up at 2m/s. If the collision of the ball with the elevator is elastic, the ball rebounds with a velocity of?

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Knowledge Check

  • A ball is dropped from a height of 10 m, as it falls,

    A
    its velocity increases and acceleration decreases.
    B
    its velocity decreases and acceleration increases.
    C
    its velocity increases and acceleration remains constant.
    D
    its velocity and acceleration remains constant.

  • Consider a rubber ball freely falling from a height h = 4.9 m on a horizontal elastic plate. Assume that the duration of collision is negligible and the collision with the plate is totally elastic. Then the velocity as a function of time and the height as a function of time will be:

    A
    B
    C
    D

  • A ball is dropped from a height of 20 m on a floor for which e = 1//2 . The height attained by the ball after the second collision

    A
    `1.25 m`
    B
    `2.5 m`
    C
    `5 m`
    D
    `10 m`

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