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2. A child sits in a wagon with a pile of 0.65kg rocks. If she can throw each rock with a speed of 11m/s relative

2. A child sits in a wagon with a pile of 0.65kg rocks. If she can throw each rock with a speed of 11m/s relative to the ground, causing the wagon to move, how many rocks must she throw per minute to maintain a constant average speed against a 3.4N force of friction

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