This problem refers to figure $1.$ Block $B$ rests as shown on the upper surface of a wedge $A.$ Immediately after the system is released from rest, find the acceleration of wedge A and the acceleration of block B$.$ Neglect friction between all surfaces. Block B weighs $15$ lbs and wedge A weighs $60$ lbs $.$

The acceleration of wedge $A$ is $f\frac{t}{s^2}$

The acceleration of wedge $B$ is $f\frac{t}{s^2}.$

FIGURE $1$