Figure shows two blocks, each of mass m. The system is released from rest. If accelerations of blocks A and B at any instant (not initially) are a1 and a2, respectively, then .

Let at any time, their velocities are v1 and v2, respectively.Then v1=v2cos⁡θDifferentiating: a1=a2cos⁡θ−v2sin⁡θdθdtHence, none of them is correct.[Note: Option (a) is correct initially, because initially v2=0]