Question

In the Figure, the pulley P moves to the right with a constant
speed u. The downward speed of A is Va, and the speed of B to
the right is VB.
(A) VB = VA
(B) VB = u + VA
(C) VB + U = VA
(D) the two blocks have accelerations of the same magnitude​

Answer 1

Answer:

B IS THE CORRECT ANSWER

Answer 2

Answer:

B and D both are correct

Explanation:

Take the pulley as frame of reference. And apply constrained of string equations. I.e. T. (Vb-u) = T.Va

This gives Vb=u+Va

And now by differentiating this you will get acc.of b and a as equal.