A 745 N man stands in the middle of a frozen pond of radius 4.0 m. He is unable to get to the other side becau

Question

A 745 N man stands in the middle of a frozen pond of radius 4.0 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 1.2 kg physics textbook horizontally toward the north shore at a speed of 4.0 m/s. How long does it take him to reach the south shore?

Answer 1

he provides 4.8 Ns of momentum to the book, so he also has 4.8 Ns of momentum. His mass is approx 76 kg (745/9.8), so his speed is about .06 m/s. The time is found by 4m / (.06 m/s) = 66.6666... seconds