IB Physics HL A 1 9 Fluid Resistance on Projectiles Topic Practice

A football player kicks a stationary ball of mass 0.45 kg towards a wall. The initial speed of the ball after the kick is $19 \mathrm{~m} \mathrm{~s}^{-1}$ and the ball does not rotate. Air resistance is negligible and there is no wind.

In practice, air resistance affects the ball. Outline the effect that air resistance has on the vertical acceleration of the ball. Take the direction of the acceleration due to gravity to be positive.