A block is placed over a plank which in turn is placed on a smooth level horizontal surface. The coefficient of friction between the block and plank is $$0.2$$. Initially both are at rest, suddenly the plank starts moving with accelerations $$a=$$ $$4ms-2$$. The displacement of the block in $$1sec$$ is (g=10$$ $$m/s2).

Question

A block is placed over a plank which in turn is placed on a smooth level horizontal    surface. The coefficient of friction between the block and plank is $$0.2$$. Initially    both are at rest, suddenly the plank starts moving with accelerations $$a=$$ $$4ms-2$$. The    displacement of the block in $$1sec$$ is (g=10$$ $$m/s2).

Infinity Learn · Accepted Answer

pseudo force acting on the block ma and frictional force is μmg net force backward direction w.r.t plank is  $$ma-$$μg $$=ma$$' a'$$=4-0.2x10$$ $$=2ms-2$$ displacement w.r.t to plank is $$12212=$$ $$1m$$

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