A man in a boat A pulls a rope with a force 100N. The other end of the

1.	A man in a boat A pulls a rope with a force 100N. The other end of the rope is tied to a boat B of mass 200 kg. the total mass of boat A and man is 300kg, disregard the weight of the rope and the resistance of the water. The power developed by the man by the end of the third second is a) 100W b) 200 W c) 150W d) 250 W
Answer» d) 250 W P = F V_rel V_rel = V_BA = t 2.5 m/s P = + 100 (2.5) P = 250 w

A man in a boat A pulls a rope with a force 100N. The other end of the rope is tied to a boat B of mass 200 kg. the total mass of boat A and man is 300kg, disregard the weight of the rope and the resistance of the water. The power developed by the man by the end of the third second is a) 100W b) 200 W c) 150W d) 250 W

Answer»

d) 250 W

P = F V_rel

V_rel = V_BA = t 2.5 m/s

P = + 100 (2.5)

P = 250 w

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