A Brass Ball Is Shot Vertically Upward from the Surface

A brass ball is shot vertically upward from the surface of an atmosphere-free planet with an initial speed of 20.0 m/s. One second later, the ball has an instantaneous velocity in the upward direction of 15.0 m/s.
-Determine the velocity of the ball when it returns to its original position. Note: assume the upward direction is positive.

A) +20 m/s
B) -20 m/s
C) +40 m/s
D) -40 m/s
E) zero m/s

Correct Answer:

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