A long block A is at rest on a smooth horizontal surface. A small block B, whose mass is half of A, is placed on A at one end and projected along A with some velocity u. The coefficient of friction between the blocks is `mu`:
A. The blocks will a final common velocity `(u)/(3)`.
B. The work done against friction is two-thirds of the initial kinetic energy of B.
C. Before the blocks reach a common velocity, the acceleration of A relative to B is `(2)/(3)mu g`.
D. Brfore the blocks reach a common velocity the acceleration of A relative to B is `(3)/(2)mu g`.
