Physics

Problem

A particle of mass

m

moves on positive

x

-axis under the influence of force acting towards the origin given by

-kx^2\hat{i}

. If the particle starts from rest at

x = a

, the speed it will attain when it crosses the origin is (A)

\sqrt{\frac{k}{ma}}

(B)

\sqrt{\frac{2k}{ma}}

(C)

\sqrt{\frac{ma}{2k}}

(D) None of these