A plank is held at an angle α to the horizontal on two fixed supports A and B. The plank can slide against the supports (without friction) because of its weight Mg. Acceleration and direction in which a man of mass m should move so that the plank does not move is:

Question

A plank is held at an angle $α$ to the horizontal on two fixed supports $A$ and $B$ . The plank can slide against the supports (without friction) because of its weight $M g$ . Acceleration and direction in which a man of mass $m$ should move so that the plank does not move is:

g \sin α (1 + \frac{m}{M}) down the incline

g \sin α (1 + \frac{M}{m}) up the incline

g \sin α (1 + \frac{m}{M}) up the incline

g \sin α (1 + \frac{M}{m}) down the incline

Solution

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