Friday
April 29, 2016

# Homework Help: Physics

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

*I am lost on a bunch of different problems, and this is one of them. Please note that I am NOT asking for final answers, just some guidance so that I can figure out how to do the problem!!! I know that a lot of times on this site it is commented that we are fishing for answers, but I just need some guidance on some stuff I honestly cannot figure out how to do, no matter how easy it might seem to others.

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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