Help with physics question?

Question

A 748 N student stands in the middle of a frozen pond having a radius of 5.7 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 2.2 kg physics textbook horizontally toward the north shore at a speed of 5.2 m/s. How long does it take him to reach the south shore?

Answer 1

Divide his weight by g to get his mass M.

Conserve momentum to get his velocity: V = 5.2m/s*2.2kg/M

Divide the radius by V to get the time, about 38 seconds.