A 776 N student stands in the middle of a frozen pond having a radius of 4.2 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 2.7 kg physics textbook horizontally toward the north shore at a speed of 5.3 m/s. How long does it take him to reach the south shore?

Question

nottim · Answer

x and y forces

anonymous · Answer

momentum must be conserved. So mv=mv. 
(2.7)(3)=(776/9.81)(x) Solves for x to find his speed
then divide 4.2 by his speed to find time

anonymous · Answer

i divided 776 by 9.81 because it was 776N not 776kg