Which of the following statements is true regarding potential energy and kinetic energy?

a. water at the top of a dam has potential energy; water falling through a dam has kinetic energy. the moving water performs work by moving the blades of turbines in the dam to generate electricity.
b. water gains kinetic energy as it falls through a dam; water uses potential energy as it moves the blades of turbines in the dam to generate electricity.
c. water gains potential energy as it falls through a dam; water uses kinetic energy as it moves the blades of turbines in the dam to generate electricity.
d. water at the top of a dam has kinetic energy; water falling through a dam has potential energy. the moving water performs work by moving the blades of turbines in the dam to generate electricity.

The correct answer is a.

Explanation:

Potential energy is energy that an object gains while at rest before falling.  When falling, it gains kinetic energy, which is the speed at which an object is falling after staying at rest.

EX: If you lay an onion on a table, it is gaining potential energy.  However, whenever the onion rolls off the table and falls to the ground, it's building up on its kinetic energy.  Eventually, according to Newton's First Law, it will come to a stop and regain its potential energy.

Just think of kinetic energy as releasing energy and potential energy as stored energy.

Hope this helps! :)

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

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