A cyclist is travelling at 21 km/h when she sees a stop sign ahead.  She applies the brakes and comes to a stop in 15 m.  The mass of the cyclist and the bike is 73 kg. a. Calculate the acceleration of the cyclist. b. Determine the coefficient of friction between the road and the bike tires.

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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?”