Two Equal Masses Are Raised at Constant Velocity by Ropes

Multiple Choice

Two equal masses are raised at constant velocity by ropes that run over pulleys, as shown below. Mass B is raised twice as fast as mass A. The magnitudes of the forces are FA and FB, while the power supplied is respectively PA and PB. Which statement is correct? ​ ​

A) FB = FA; PB = PA.
B) FB = FA; PB = 2 PA.
C) FB = 2 FA; PB = PA.
D) FB = 2 FA; PB = 2 PA.
E) PA = FA; PB = FB.