A 10 kg block is placed on top of a 40 kg block as shown in figure. A horizontal force F acting on B causes an acceleration of 2 ms-2 to B. For this situation, mark out the correct statement(s).

For the 40 kg block, 100 - f = 40×2                          ⇒f = 20 N If the blocks move together without any relative motion between them, then a1 = 2 m/s2 and in this case fl >20 N ⇒μ×10×10 >20 ⇒μ>0.2If a1