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You throw a 20 N rock into the air from ground level and observe that, when it is 15.0 m high, it is travelling upward

  • You throw a 20 N rock into the air from ground level and observe that, when it is 15.0 m high, it is travelling upward at 25.0 m/s. Use the work-energy principle to find (a) the rock’s speed just as it left the ground and (b) the maximum height the rock will reach.

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