A 720 N man stands in the middle ofa frozen pond of radius 9.0 m. He isunable to get to the other side because of a lack of frictionbetween his shoes and the ice. To overcome this difficulty, hethrows his 1.2 kg physics textbook horizontally toward the northshore at a speed of 9.0 m/s. How longdoes it take him to reach the south shore?