If the acceleration of the object moving down the rough ramp as shown in the diagram below is 4 m/s/s, what is the coefficient of kinetic friction? Consider g=10 m/s/s and the following trigonometric values: sin 600=0.87 cos 60⁰=0.5 0.43 O 0.8 20.0 kg 60.0⁰

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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?”