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A wooden plank of mass 20 kg is resting ...

A wooden plank of mass 20 kg is resting on a smooth horizontal floor. A man of mass 60 kg starts moving from one end of the plank to the other end. The length of the plank is 10 m. Find the displacement of the plank over the floor when the man reaches the other end of the plank.

A

7.5

B

2.5

C

1.5

D

10

Text Solution

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The correct Answer is:
A
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A wooden plank of mass 20kg is resting on a smooth horizontal floor. A man of mass 60kg starts moving from one end of the plank to the other end. The length of the plank is 10m . Find the displacement of the plank over the floor when the man reaches the other end of the plank.

A plank of mas M and length L is at rest on as frictionless floor. The top surface of the plank has friction. At one end of it a man of mass m is standing as shown in figure. If the man walks towards the other end the find the distance, which the plank moves a till the man reaches the centre of the plank. b. till the man reaches the other end of the plank.

Knowledge Check

  • A uniform wooden plank of mass 150 kg and length 8 m is floating on still water with a man of 50 kg at one end of it . The man walks to the other end of the plank and stops. Than the distance covered by the plank is

    A
    1 m
    B
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    C
    2 m
    D
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  • 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 man of mass 80 kg stands on a plank of mass 40 kg . The plank is lying on a smooth horizontal floor. Initianlly both are at rest. The man starts walking on the plank towards north and stops after moving a distance of 6 m on the plank. Then

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    B
    The plank will slide to the north by a dsitance `4m`
    C
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    D
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    No external force: Stationery mass relative to an inertial frame remains at rest A man of mass m is standing at one end of of a plank of mass M. The length of the plank is L and it rests on a frictionless horizontal ground. The man walks to the other end of the plank. Find displacement of the plank and man relative to the ground.

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