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1. An object of mass 70 kg is accelerated by a net force of 20 N. What is its acceleration?

My answer is .286 N

2. A speedboat has a mass of 5.0 x 10

^{3}kg. It starts from rest and travels 2.0 x 10

^{2}m in 6.0 seconds. The boat undergoes uniform acceleration during the 6.0 seconds. What is the net force on the boat?

My answer is 55,550 N

3. A 75 kg girl traveling at a constant velocity on ice skates suddenly experiences an acceleration of -4 m/s

^{2}. What is the sum of the forces acting on her?

My answer is (HAH!). I don't even know where to begin. Any tips?