A body moves in a circle of radius $2$ m at a constant speed of $4$ m s$^{-1}$. Find its centripetal acceleration.
A$16$ m s$^{-2}$
B$8$ m s$^{-2}$CORRECT
C$32$ m s$^{-2}$
D$2$ m s$^{-2}$
JUPEBPhysicsCircular and Simple Harmonic Motion
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Why the answer is B, and why the others tempt you.
$a = \dfrac{v^2}{r} = \dfrac{16}{2} = 8$ m s$^{-2}$, directed towards the centre. Using $v/r$ gives 2 and $v^2 r$ gives 32.
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