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A 126 g baseball has a velocity of 31 m/s. What is its kinetic energy in J? A 142 lb student runs up a stairway

A 126 g baseball has a velocity of 31 m/s. What is its kinetic energy in J? A 142 lb student runs up a stairway to a classroom 14 ft above ground level in 19 s. What was the average power output in hp? Hint: 1 hp = 550 lb.ft/s

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