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Goalkeeper Bruce Grobbelaar kicks the ball with a 100 Newton force, causing the ball to accelerate at 30 metres per second^{2}.

What is the magnitude of the force exerted by the ball on the goalkeeper?

- 10N
- 33.333N
- 100N
- 300N
- 3,000N

100 Newtons. Every action (force) produces an equal and opposite reaction. Therefore the force exerted on Bruce by the ball is 100N in the opposite direction.