Posted by **Katrina** on Monday, February 19, 2007 at 6:21pm.

A 0.2 kilogram baseball is thrown vertically downwards towards to the same horizontal floor. The baseball possesses an initial velocity of 30 meters per second. The height is 10.00m.

(A) Calculate the POTENTIAL GRAVITATIONAL ENERGY and KINETIC ENERGY of the baseball at the moment of release from the thrower's hand.

Is Potential Energy=19.62J?and Kinetic energy=90J?

(B) Calculate the POTENTIAL and KINETIC ENERGY of the baseball at the moment of impact at the floor.

Is Potential Energy=0J? and Kinetic energy=109.62J?

I am not really sure about the answers. Please help check.

(A) Yes to both questions, assuming the zero for potential energy is taken as the ground elevation. Potential energy can be defined as zero anywhere. It is only the changes in P.E. that matter in the energy and motion quations

(B) Yes again. You seem to have a good grasp of the situation.

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