A marble trackway is built in the shape of a half circle of radius 3.00 m. The half circle is oriented so that its two ends are at equal height above the midpoint of the trackway, which touches the floor.
The marble is released from rest at one end of the trackway. It approaches but does not reach the other end of the trackway, stopping momentarily at height 2.88 m above the floor before reversing direction.
With each roll of the marble from one side of the half-circle to the other side, what percentage of its mechanical energy does it lose?
12%
7.5%
4.0%
2.0%
