posted by Elisa .
A 705 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?
initial momentum North = 0
no external horizontal forces on system
therefore final momentum North = 0
0 = (705/9.8)V + 1.2 * 4
V is his speed north, it is negative so he goes south of course. I think you can do distance = rate * time