A block of mass 1 kg is horizontally thrown with a velocity of 10 m/s on a stationary long plank of mass 2 kg whose surface has a μ = 0.5 . Plank rests on frictionless surface. The time when m 1 com

Question

A block of mass 1 kg is horizontally thrown with a velocity of 10 m/s on a stationary long plank of mass 2 kg whose surface has a μ = 0.5 . Plank rests on frictionless surface. The time when m 1 ​ comes to rest w.r.t. plank is:

TestHub · Accepted Answer

Friction = 0.5 × 1 × 10 = 5 N retards the block at 5 m/s² and drives the plank at 2 5 ​ = 2.5 m/ s 2 . Relative retardation = 7.5 m/s², so the block stops relative to the plank at t = 7.5 10 ​ = 3 4 ​ s. Option C.

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