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1. How much work has gravity done on a 2.0 kg ball done in the first 3.5 seconds after being dropped? 3. If gravity does

1. How much work has gravity done on a 2.0 kg ball done in the first 3.5 seconds after being dropped? 3. If gravity does 45 N-m worth of work in 1.2 seconds on a rock falling from rest, what is the rock's mass? 4. How far has a baseball fallen if its kinetic energy changes by 600 J? (A baseball has a mass of about 0.14 kg.)

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