Given this image, assume it has friction. After rolling down the left hill, the boulder then continues up an adjacent hill on the right, reaching a vertical height of 25m before coming to a stop. It travelled a total distance of d= 500m. Calculate the average friction force on the boulder.

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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?”