Help please--multiple choice Two identical blocks are lifted at constant velocity by ropes that run over frictionless pulleys, as shown in the diagram. Block B is raised twice as fast as Block A. The magnitudes of the forces are respectively 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.