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A stone drope from the window of a stati...

A stone drope from the window of a stationary bus takes 4 seconds to reach the ground. In what time the stone will reach the groun when the bus is moving with (a) constant velocity of 108 km h^(-1)` (b) constant acceleration of ` 2 km h&(-2)`.

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(a) 4 seconds (b) 4 seconds. In bothe the cases the initail vertical downward velocity is zero and the vertical downward accleration is acceletation due to gravity g and the stone is to cover the same vertical height in each case.
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Knowledge Check

  • A stone is dropped from roof of building takes 5 s to reach the ground. The sound of striking is heard after 5.4 second after the stone is dropped. The velocity of sound is

    A
    `312.5 ms^(-1)`
    B
    `332.5 ms^(-1)`
    C
    `352 ms^(-1)`
    D
    `392 ms^(-1)`

  • A ball is dropped from a tower of height h under gravity. If it takes 4s to reach the ground from height h/2 , then time taken by it to reach from h to h/2 is nearly:

    A
    `9.65s`
    B
    `6.35s`
    C
    `8.35s`
    D
    `5.65s`
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