A 40-cm-diameter, 480 g beach ball is dropped with a 4.0 mg ant riding on the top. The ball experiences air resistance, but the ant does not. Take ρair = 1.2 kg/m3.What is the magnitude of the normal force exerted on the ant when the ball's speed is 3.0 m/s?

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Q: ctional force o

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Q: is the final speed?

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”