You throw a 20-N rock vertically into the air from ground level. You observe that when it

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You throw a 20-N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work-energy theorem to find
(a) The rock's speed just as it left the ground and
(b) Its maximum height.
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