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Question: A man stands on a plank that is placed on a smooth surface. The plank is given an impulse and it mov...

A man stands on a plank that is placed on a smooth surface. The plank is given an impulse and it moves along with the man with constant velocity. There is enough friction between the man and the plank to prevent any relative motion between them. The direction of the force exerted by the plank on the man during the motion is correctly represented b y:

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Answer
Explanation

Solution

During the motion (man + plank) system moves with constant velocity thus their horizontal acceleration is zero. Only force by the plank of the man is normal, as there can not be any horizontal force by the plank on the man.