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A man of mass m is standing on a plank k...

A man of mass m is standing on a plank kept on ground having mass m. There is no friction between the plank and the ground. If the man walks with an acceleration a w.r.t. the plank when calculate the acceleration of the plank w.r.t. the ground. Also calculate frictional force exerted by the plank on man.

Text Solution

Verified by Experts

The correct Answer is:
`A=(a)/(2); f=(ma)/(2)`
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Knowledge Check

  • A man of mass m is standing on a plank of equal mass m resting on a smooth horizontal surface. The man starts moving on the plank with speed u relative to the plank. The speed of the man relative to the ground is

    A
    2u
    B
    `u/2`
    C
    zero
    D
    `u/4`

  • A disc of mass m and radius R is placed over a plank of same mass m. There is sufficient friction between disc and plank to prevent slipping. A force F is applied at the centre of the disc. Acceleration of the plank is

    A
    `(F)/(2m)`
    B
    `(3F)/(4m)`
    C
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    D
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    A
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    D
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