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October 21, 2014

October 21, 2014

Posted by **Justin** on Sunday, October 8, 2006 at 3:27pm.

You throw a 19.0 N rock into the air from ground level and observe that, when it is 11.0 m high, it is traveling upward at 25.0 m/s.

Use the work-energy principle to find the rock's speed just as it left the ground.

Answer expressed in m/s.

Use the work-energy principle to find the maximum height the rock will reach.

Answer expressed in m.

Energy at ground= PEat11meters + KE at 11 meters.

Solve that for energy at the ground.

AT max height.

energyground= PE at max height= mgh

solve for h.

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