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3. A 60 g plastic ball is moving to the left at 19 m/s . How much work must be done on the ball to cause it to move to the right at 19 m/s ?

3. A 60 g plastic ball is moving to the left at 19 m/s . How much work must be done on the ball to cause it to move to the right at 19 m/s ?


4.A 2.0 kg book is lying it on a 0.80m high table. You pick it up and place it on bookself 2.0 m above the floor.

A. During this process, how much work does gravity do on the book?

B. During this process, how much work does your hand do on the book?

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