1. A 1.12 kg skateboard is coasting along the pavement at a speed of 5.08 m/s when a 0.80 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination?
2. A 750 N student stands in the middle of a frozen pond having a radius of 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 2.9 kg physics textbook horizontally toward the north shore at a speed of 5.0 m/s. How long does it take him to reach the south shore?
Need help on physics?
i think for the first problem, the answer is 2.96 m/s.
because momentum is conserved..
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