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Starting from rest, a 1.9 × 10-4-kg fl ea springs straight upward. While the fl ea is pushing off from the ground, the ground exerts an average upward force of 0.38 N on it. This force does + 2.4 × 10-4 J of work on the fl ea.
(a) What is the flea s speed when it leaves the ground?
(b) How far upward does the flea move while it is pushing off? Ignore both air resistance and the flea s weight. |
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