Two boxes are in the back of a truck. The truck comes to an emergency stop, and both boxes slide with respect to the truck. Assuming the same coefficient of friction between each box and the back of the truck, which box will slide first?     (a) The lighter box         (b) The heavier box         (c) Both boxes slide at the same time

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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?”