The ball exerts a force of 5 N on Alice's foot because every action has an equal and opposite reaction.
The third law of motion states that every action has an equal and opposite reaction. Force is the influence that can accelerate the object.
In the question, Alice kicks the ball with a force of 5 N, so, the ball will also exert an equal force but in opposite direction.
Therefore, the ball exerts a force of 5 N on Alice's foot.
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