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 speed of the ball when it reaches its final position,r_f?

A) 552 m/s
B) 531 m/s
C) 478 m/s
D) 442 m/s
E) 404 m/s

Correct Answer:

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