Question

A block is resting on a horizontal plane and the coefficient of friction is given by

Answer 1

hey mate , here is ur answer

as the plate begins to move frictional force acts on the block along the direction of velocity to prevent relative motion.

when the force exceed the maximum static friction the block will move.

a=dv/dt=2bt and the force by plate on block=ma(where m is the mass of block)

so when ma exceeds μmg then the block begins to slide

so ma>=μmg so t>=μg/2b

so at t=μg/2b the block slides