12. A 200 N block is pulled by a constant force of P=50 N as shown. The block initially at rest, attained a velocity of 10m/s after travelling 40m. 30° 200 N

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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?”