A ball with mass $m$ is projected straight upwards. At the moment the ball’s speed is $v$, the air resistance on the ball has magnitude $F$. What is the magnitude of the ball’s acceleration when its speed is $v$ during its upward motion and during its downward motion?
- Aacceleration when ball is rising: $g - \frac{F}{m}$; acceleration when ball is falling: $g - \frac{F}{m}$
- Bacceleration when ball is rising: $g - \frac{F}{m}$; acceleration when ball is falling: $g + \frac{F}{m}$
- Cacceleration when ball is rising: $g + \frac{F}{m}$; acceleration when ball is falling: $g - \frac{F}{m}$
- Dacceleration when ball is rising: $g + \frac{F}{m}$; acceleration when ball is falling: $g + \frac{F}{m}$