A) \[\frac{m{{v}^{2}}}{\pi {{r}^{2}}}\]
B) Zero
C) \[\frac{m{{v}^{2}}}{{{r}^{2}}}\]
D) \[\frac{\pi {{r}^{2}}}{m{{v}^{2}}}\]
Correct Answer: B
Solution :
Work done by centripetal force is always zero, because force and instantaneous displacement are always perpendicular. \[W=\overrightarrow{F}.\overrightarrow{s}=Fs\cos \theta =Fs\cos (90{}^\circ )=0\]
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