A particle of mass 3kg moves under the influence of the force F(x) = 7/x N. If its speed at x=2.0 m is v=3 m/s, what is its speed at x=7.0 m?

A) 1.12 m/s
B) 1.71 m/s
C) 2.06 m/s
D) 2.53 m/s"