In which one of the following situations will there be an increase in kinetic energy?
A)A projectile approaches its maximum height.
B)A ball starts from rest and freely rolls downhill.
C)A box is pulled across a rough floor at constant speed.
D)A satellite travels in a circular orbit around the earth at fixed altitude.
E)A stone at the end of a string is whirled in a horizontal circle at constant speed.

Question

Quizplus · Accepted Answer

As the ball rolls downhill, it gains kinetic energy due to its increasing speed. A projectile at its maximum height has zero velocity, a box pulled at a constant speed has constant kinetic energy, a satellite in circular orbit has constant kinetic energy, and a stone whirled in a horizontal circle has constant kinetic energy because its speed is constant.

In Which One of the Following Situations Will There Be