Circular MotionHard
Question
The kinetic energy k of a particle moving along a circle of radius R depends on the distance covered s as k = as2 where a is a positive constant. The total force acting on the particle is :
Options
A.2a
B.2as
C.2as
D.2a
Solution
K = 
mv2 = as2 ⇒ v2 = 
aC =
= 
at =
= 
a =
= 
Total force = ma = 2as
Ans.
mv2 = as2 ⇒ v2 = aC =
= at =
= a =
= Total force = ma = 2as
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