A Rock Held Above the Ground Has Potential Energy

question 112

Multiple Choice

A rock held above the ground has potential energy.As the rock falls,this potential energy is converted to kinetic energy.Finally,the rock hits the ground and stays there.What has happened to the energy?

• A)The energy goes to producing sound and to heating the ground,rock,and surrounding air.
• B)The energy goes into the ground,and as a result,the orbit of the Earth about the Sun is slightly changed.
• C)The rock keeps the energy inside it in the form of mass-energy.
• D)It is transformed back into gravitational potential energy.

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