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Most Important Selected Qs for JEE AdvancedPhysicsLaws of Motion

In the figure shown a plank of length L=16 ~m , mass m ₂=5 ~kg rests on a smooth surface. Upper surface of plank is rough with coefficient of kinetic friction _ k =0.5 and static friction _ s =0.6 . A small block of mass m₁=2 ~kg is placed over it. A force F of magnitude 30 N is applied on block m ₁ . What is displacement of plank (in m ) till the small block falls over from plank ?

Correct answer

4

Step-by-step solution

Slipping occurs : a_ m₁ =10 ~m / s ^2, a_ m₂ =2 ~m / s ^2a_ m₁ / m₂ =8 ~m / s ^2, ~S =16 ~m t =2 sec

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