A boy runs around a circular track of constant radius at an increasing speed. The magnitude of his centripetal acceleration
A) decreases.
B) increases.
C) is zero.
D) is unknown; more information is needed to work out the answer.

Question

Quizplus · Accepted Answer

Centripetal acceleration is given by the formula $a_c = \frac{v^2}{r}$, where $v$ is the velocity and $r$ is the radius of the circular path. If the speed ($v$) increases and the radius ($r$) remains constant, the magnitude of the centripetal acceleration ($a_c$) increases.

A Boy Runs Around a Circular Track of Constant Radius