A) the net displacement is zero
B) the force is not real
C) the force is zero
D) the force is perpendicular to the displacement at every instant
Correct Answer: D
Solution :
Student who consider \[W=F\times \]displacement will mark option [A]. Correct option is [D]. Note that in a uniform circular motion the centripetal force is along the radius whereas the displacement is along a tangent to the circular path. Since the force and the displacement are perpendicular to each other at every instant the work done is zero.
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