John is pulling on a rope to take a sled up the hill and the sled is about to move. The masses of the sled and John are 20 kg and 65 kg, respectively. The coefficient of static friction between the ground and the sled is 0.2. How much is the static friction force applied to John's feet? 0 = 20° a = 30°

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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?”