3555

Physics Dimensions Level: University

Motion in one Dimension
A tennis 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. What is the magnitude of the acceleration due to gravity on the surface of this planet?
a. 5.0 m/s2
b. 9.8 m/s2
c. 12 m/s2
d. 15m/s2
e. 24 m/s2