Two persons A and B weighing 141 and 182 lb, respectively, jump off a floating p

Question

Two persons A and B weighing 141 and 182 lb, respectively, jump off a floating platform (in the same direction) with a velocity relative to the platform that is completely horizontal and with a magnitude of Vo = 6.4 ft/s for both A and B. The floating platform weighs 846 lb. Assume that A, B and the platform are initially at rest. Neglecting the water resistance to the horizontal motion of the platform, and knowing that A jumps first, determine the speed of the platform after A and B have both jumped.

Explanation / Answer

141 x 6.4 + 182 x 6.4 = (141+182+846)V
1169V = 902.4 + 1164.8
V = 1.77 ft/s

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