A(n) 692 N man stands in the middle of a frozen pond of radius 7.5 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.5 kg physics textbook horizontally toward the north shore, at a speed of 7.3 m/s. The acceleration of gravity is 9.81 m/s 2 . How long does it take him to reach the south shore? Answer in units of s