A football is kicked at an angle theta with respect to the horizontal. Which one

Question

A football is kicked at an angle theta with respect to the horizontal. Which one of the following statements best describes the acceleration of the football during this events if air resistance is neglected? The acceleration is zero m/s^2 at all times. The acceleration is 9.8 m/s^2 at all times. The acceleration is zero m/s^2 when the football has reached the highest point in its trajectory. The acceleration is positive as the football raises, and it is negative as the football falls. The acceleration starts at 9.8 m/s^2 and drops to some constant lower value as the ball approaches the ground.

Explanation / Answer

B is right. Remember, without air resistance, while the football is in the air, the only force acting on it is gravity. As a result, the football is in freefall. Therefore, the acceleration is constant, and its value is 9.8m/s^2 downwards.

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