A body of mass 10 kg is moving with an initial speed of 20 m s - 1 . The body stops after 5 s due to friction between body and the floor. The value of the coefficient of friction is: (Take acceleration due to gravity g = 10 m s - 2 )

Question

A body of mass 10 kg is moving with an initial speed of 20 m s - 1 . The body stops after 5 s due to friction between body and the floor. The value of the coefficient of friction is: (Take acceleration due to gravity g = 10 m s - 2 ), 0 . 2, 0 . 3, 0 . 5, 0 . 4

MARKS App · Accepted Answer

Friction force wil act opposite to the motion of the body. F = μ N = μ m g ⇒ a = - μ g -ve sign for direction relative to the motion of body Now, applying equation of motion, we get v = u + a t ⇒ 0 = 20 + - μ × 10 × 5 ⇒ 50 μ = 20 ⇒ μ = 0 . 4

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