A 2.0 kg object is lifted 2.0m off the floor, carriedhorizontally across the roo

Question

A 2.0 kg object is lifted 2.0m off the floor, carriedhorizontally across the room, and finally placed down on atable that is 1.5m high. What is the overall change in gravitational potential energyfor the earth-object system. please explain this question and give a step by stepsolution. A 2.0 kg object is lifted 2.0m off the floor, carriedhorizontally across the room, and finally placed down on atable that is 1.5m high. What is the overall change in gravitational potential energyfor the earth-object system. please explain this question and give a step by stepsolution.

Explanation / Answer

It's asking for what the overall change in the gravitationalpotential energy (= mass x gravity x height (m)) of the object. Initially, its = 2 kg X 0 m X 9.81 = 0. After all the stuff that's done to it (lifting, setting down, etc),it's 2 x 1.5 x 9.81. Just remember that gravitational potential energy is given by PE =mgh, and the fact that it was lifted off the ground 2m before beingset down 1.5m has nothing to do with the OVERALL change, you'rejust comparing its potential energy at 0 m off the ground to itspotential energy 1.5 m off the ground.

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