Two blocks $A$ and $B$ of equal mass are initially in contact when released from rest on an inclined plane. The coefficients of friction between the inclined plane and blocks $A$ and $B$ are $\mu_1$ and $\mu_2$ respectively.

• A
  If $\mu_1 > \mu_2$,the blocks will always remain in contact.
• B
  If $\mu_1 < \mu_2$,the blocks will slide down with different accelerations (if the blocks slide).
• C
  If $\mu_1 > \mu_2$,the blocks will have a common acceleration $\frac{1}{2} (\mu_1 + \mu_2) g \sin \theta$.
• D
  Both $(A)$ and $(B)$.