Physics - Review Answer 49

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49.	As a ball rolls down a hill
	A.	kinetic energy and potential energy both increase.	As the ball rolls down a hil its velocity increases. KE = 1/2 mv² thus KE also increases. The gravitational potential energy is dependent on the height of the ball. PE = mgh Since h decreases, the Potential Energy also decreases. The Correct Answer is B.
	B.	kinetic energy increases and potential energy decreases.
	C.	kinetic energy decreases and potential energy increases.
	D.	kinetic energy and potential energy both decrease.