Question

A block of mass m is placed on a plank of mass M. The system of block and plank is placed on a smooth horizontal surface. If both block and plank move together under a constant force F then the frictional force between the block(m) and the plank(M) is: _____________ (A)FM/(M+m) (B)Fm/(m+M) (C)F(M+m)/m (D)F(M+2m)/(M+m)

Answer 1