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 floor. The coefficient of friction is: [g = 10 m s⁻²]
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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 floor. The coefficient of friction is: [g = 10 m s⁻²]

G1 Physics · Accepted Answer

Retardation a = (0−20)/5 = −4 m s⁻². On a horizontal surface, |a| = μg, so μ = 4/10 = 0.4.