A 300 Kg Ball Is Released from Rest and Is Acted

A 30.0 kg ball is released from rest and is acted upon by a net force of -1.40  10¹⁶ r ^-2 (the force pulls the ball towards r = 0) .The ball starts from rest at an initial position of r_i = 6.39  10⁶ m and moves under the influence of the force to a final position of r_f= 6.38  10⁶.What is the kinetic energy of the ball when it reaches its final position,r_f?

A) 2.94  10⁶ J.
B) 9.22  10⁶ J.
C) 1.58  10⁶ J.
D) 3.75  10⁶ J.
E) 3.43  10⁶ J.