A) Both (A) and (R) are true and (R) is the correct explanation of .
B) Both (A) and (R) are true but (R) is not the correct explanation of .
C) (A) is true but (R) is not true.
D) (A) is not true but (R) is true.
Correct Answer: B
Solution :
In a circular motion, the direction of resultant force is towards centre and its magnitude is \[F=\frac{m{{v}^{2}}}{r}\] or \[F=mr{{\omega }^{2}}\] Thus, a centripetal force of magnitude \[\frac{m{{v}^{2}}}{r}\]is needed to keep the particle moving in a circle with constant speed.
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