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Q. A 3500 kg block falls vertically through 5.0 m and then collides with a 400 kg pile, driving it 3.0 cm into bedrock. Assuming that the block-pile collision is completely inelastic, find the magnitude of the average force on the pile from the bedrock during the 3.0 cm descent.

Q. A 9.9 V battery is connected to a bulb whose resistance is 2.1 . How many electrons leave the battery per minute?

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