Question
A player throws a ball upwards with an initial speed of 29.4 m/s. Choose x = 0 m and t = 0 s to be the location and time of the ball at its highest point, vertically downward direction to be the positive direction of X-axis, then give the signs of position, velocity and acceleration of the ball during its upward and downward motion.
Solution
| During downward motion | During upward motion | |
| Position | Positive | Positive |
| Velocity | Positive | Negative |
| Acceleration | positive | Positive |
