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What is the mass of a falling rock if it hits the ground with a force of 371 N? Hint: the free fall acceleration of

What is the mass of a falling rock if it hits the ground with a force of 371 N? Hint: the free fall acceleration of the rock is 9.8 m/s2 (F = m a)

A 5.2 kg box is sliding along a level floor. It is slowing down at a rate of 0.45 m/s2. What is the force of friction the floor is exerting on the box? (F = m a)

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