A tugboat pulls a ship so that the ship moves at constant speed in
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A tugboat pulls a ship so that the ship moves 150m at constant speed in 3.0min. Which statement correctly compares the tugboat’s average power to the ship’s average rate of change of kinetic energy during this interval?
(a) Both the tugboat’s average power and the ship’s average rate of change of kinetic energy are positive and equal.
(b) Both the tugboat’s average power and the ship’s average rate of change of kinetic energy are zero because the speed is constant.
(c) The tugboat’s average power is positive, while the ship’s average rate of change of kinetic energy is zero.
(d) The tugboat’s average power is negative, while the ship’s average rate of change of kinetic energy is positive.