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The kinetic energy \( k \) of a particle moving along a circle of radius \( R \) depends on the distance covered \( s \) as \( k=a s^{2} \) where \( \mathrm{a} \) is a positive constant. The total force acting on the particle is:
(a) \( 2 a \frac{s^{2}}{R} \)
(b) \( 2 a s\left(1+\frac{s^{2}}{R^{2}}\right)^{1 / 2} \)
(c) \( 2 a s \)
(d) \( 2 a \frac{R^{2}}{s} \)
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