We hold the nerf gun at an angle at the floor level. We shoot the dart and it lands again at the same level, floor level. The start velocity is: horizontal start velocity -8 m/s vertical start velocity
a. 8 m/s, 0 m/s
b. 0 m/s, 8 m/s
c. -8 m/s, 8 m/s
d. -8 m/s, 0 m/s