Mark wants to come by boat to the other side of a lake, which is 1.5 km wide. With each swing, he acts on the paddle with a force of 100 N and moves the boat 3 m forward. He paddles uniformly all the way and does 50 kJ of work. Calculate the distance the paddle travels in the water with each swing. Note that the movement of the arm during the swing is the same as the movement of the paddle in the water.
