A block slides on rough horizontal surface with a velocity of 20 ~m / s . It comes to rest after travelling a distance of 80 m . The coefficient of kinetic friction between block and surface is (Take, .g=10 ~m / s ^2 )

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Correct answer: B. 0.25

Friction force, F= N and acceleration, a= -F m =- m g m a=- g=-10 Using third equation of motion, array ll & v^2=u^2+2 a s or & 0^2=(20)^2+2(-10 ) 80 or & = (20)^2 2 10 80 = 1 4 or & =0.25 array

A block slides on rough horizontal surface with a velocity of 20 ~m / s . It comes to rest after travelling a distance of 80 m . The coefficient of kinetic friction between block and surface is (Take, .g=10 ~m / s ^2 )

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