# physics

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A 755 N man stands in the middle of a frozen pond of radius 9.0 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 9.0 m/s. How long does it take him to reach the south shore?

I need this done step by step.

• physics -

He has to travel 9.0 meters. Get his speed V after throwing the book by using the law of conservation of momentum.

You will need to convert the man's weight (in N) to his mass in kg, by dividing the weight by g.

Mbook*Vbook = Mman*V

1.2 * 9.0 = (755/g)* V = 77 V
V = 0.14 m/s

Time = distance/V = 9.0 m/0.14 m/s
= ___ s

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