A 730-N man stands in the middle of a frozen pond of radius5.0 m. He is unable to get to the other side because of a lack offriction between his shoes and the ice. To overcome thisdifficulty, he throws his 1.2 kg physics textbook horizontallytoward the north shore , at a speed of 5.0 m/s. How long does ittake him to reach the south shore?