Instruction: Show all calculation and formula used. Express all answer in significant figures and scientific notation A jewelry box is placed on the dashboard of a car and slides forward when the car decelerates from 20m/s to rest in 4.0 seconds, but not if the deceleration is a little bit longer. Find the coefficient of static friction between the box and the dashboard.

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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?”