If the horizontal force F = 20 lb is applied to block A, determine the accleration of block B. Neglect the firction if any. 1) 7.0 ft/s^{2} 

From the free body diagram
shown For block B: Solving equations
(1)(3) we have So, the accleration
of block B, a_{B} = 7.29 ft/s^{2} 