With what minimum velocity \( \mathrm{v}_{0} \) should block be projected from left end A toward...

With what minimum velocity \( \mathrm{v}_{0} \) should block be projected from left end A towards end \( \mathrm{B} \) such that it reaches the other end \( \mathrm{B} \) of conveyer belt moving with constant velocity \( \mathrm{v} \) ? Friction coefficient between block and belt is \( \mu \).
a. \( \sqrt{\mu g L} \)
b. \( \sqrt{2 \mu \mathrm{gL}} \)
c. \( \sqrt{3 \mu \mathrm{gL}} \)
d. \( 2 \sqrt{\mu g L} \)