• # question_answer 55) A plate of mass (M) is placed on a horizontal frictionless surface and a body of mass (m) is placed on this plate. The coefficient of dynamic friction between this body and the plate is $\mu$. If a force $3\mu mg$ is applied to the body of mass (m) along the horizontal, the acceleration of the plate will be A)  $\frac{\mu m}{M}g$                     B)  $\frac{\mu mg}{M+m}$C)  $\frac{3\mu mg}{M}$                D)  $\frac{2\mu mg}{M+m}$

$a=\frac{\mu mg}{M}$