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Force and mass?


With what force is a player hitting a 0.4 kg baseball, if it accelerates at a rate of 80 m/s2?

A tennis player hits a tennis ball with a force of 330 N, and it accelerates at the rate of 5,500 m/s2. What is the mass of the tennis ball?

Li is pedaling his bike with a force of 220 N. The combined mass of Reese and her bike is 55 kg. What is the acceleration of his bike?

shouldn't this question be under homework help? :S
sorry man i am no physics person!
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