A Brass Ball Is Shot Vertically Upward from the Surface

Multiple Choice

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.
-How long is the ball in the air when it returns to its original position?

A) 4.0 s
B) 4.6 s
C) 8.0 s
D) 9.2 s
E) 16 s