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A block of mass 2kg is kept inside a lif...

A block of mass 2kg is kept inside a lift. Lift starts moving downward with an acceleration of a=12m/`s^(2)` .Height of the lift is 4m .Time after which block will strike roof of the lift is?

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Knowledge Check

  • A block of mass m is kept on an inclined plane of a lift moving down with acceleration of 2m//s^(2) . What should be the coefficient of friction for the block to move down with constant velocity relative relative to lift?

    A
    `mu=(1)/sqrt(3)`
    B
    `mu=0.4`
    C
    `mu=0.8`
    D
    `mu=0.5`

  • The mass of a lift if 600kg and it is moving upwards with a uniform acceleration of 2m//s^(2) . Then the tension in the cable of the lift is :

    A
    7200 N
    B
    5900 N
    C
    4700 N
    D
    zero N

  • A block of mass m is kept on an inclined plane of a lift moving down with acceleration of 2 ms^(-1) .What should be the coefficient of friction to let the block move down with constant velocity relative to lift.

    A
    `mu=(1)/(sqrt(3))`
    B
    `mu=0.4`
    C
    `mu=0.8`
    D
    `mu=(sqrt(3))/(2)`

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