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A 390 kg piano slides 3.1 m down a 23 incline and is kept from accelerating by a man who is pushing back on

A 390 kg piano slides 3.1 m down a 23 incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (see the figure(Figure 1)). Ignore friction. Figure > 1 of 1

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