# A 730-N man stands in the middle of a frozen pond of radius 5.0 m. He is unable to get to the other side because of a lack of friction between his sho

A 730-N man stands in the middle of a frozen pond of radius 5.0 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 5.0 m/s. How long does ittake him to reach the south shore?
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Conservation of momentum:
Momentum right before the book is thrown = Momentum right after the book is thrown

$v=-\frac{\left(1.2\cdot 9.8\right)\cdot 5}{730}$
$=-0.0805m/s$ (negative indicate opposite direction from thebook)
Time taken to reach the south shore = distance/velocity
$=\frac{5.0}{0.0805}$
$=62.1s$