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0.21kg pine cone falls 14 m to the ground, where it lands with a speed of 13 m / s. (a) with what speed would the pine cone have landed if there had been no air resistance? (b) did air resistance do positive work, negative work, or zero work on the pine cone? explain
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0.21kg pine cone falls 14 m to the ground, where it lands with a speed of 13 m / s. (a) with what sp...
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