Physics

Problem

Which expression gives the magnitude of the centripetal acceleration

a_c

of an object moving at constant speed

v

in a circle of radius

r

? a)

a_c = \dfrac{2v^2}{r}

a_c = \dfrac{v^2}{2r}

a_c = \dfrac{v^2}{r}

a_c = \dfrac{v^2}{2\pi r}