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Motion In A Plane

Question
CBSEENPH11018634

The K.E of a particle moving along a circle of radius r depends upon the distance covered s as, K = as2. What is the force acting on the particle? 

Solution

Given, 
K.E, K = 1/2 mv2 
This implies, 
mv2 = 2K 
When the body is moving in a circle, 

straight F space equals space mv squared over straight r space equals space fraction numerator 2 straight K over denominator straight r end fraction space equals space fraction numerator 2 as squared over denominator straight r end fraction, is the required force.