Question

A 5 kg block is kept on a horizontal platform at rest . At t=0 , the platform starts moving with a constant acceleration of 1 m/s^2 . The coefficient of friction between block and the platform is 0.2 . The work done force of friction on the block in reference frame fixed with ground in 10 sec is

Answer 1

mass of block =5kg

at time t= o

ans is 500 joule

Answer 2

Mass of the block =5kg

At the time t =o

Answer is 500 joules

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