A block of mass M1 is placed on a slab of mass M2. The slab lies on a frictionless horizontal surface. The coefficient of static friction between the block and slab is μ1 and that of dynamic friction is μ2. A force F acts on the block M1. Take g = 10 ms⁻² . If M1 = 10 kg, M2 = 30 kg, 1 = 0.5, μ2 = 0.15 and F = 40 N, what will be the acceleration with which the slab will move