Block A of mass 35 kg is resting on a frictionless floor. Another block B of mass 7 kg is resting on it as shown in the figure. The coefficient of friction between the blocks is 0.5 while kinetic friction is 0.4. If a force of 100 N is applied to block B, the acceleration of the block A will be (g = 10 m s–2) :
(A) 0.8 m s–2
(B) 2.4 m s–2
(C) 0.4 m s–2
(D) 4.4 m s–2
