A 1.00-kg mass is observed to accelerate at 10.0 m/s2 in a direction 30.0° north of east (Fig). The force F2 acting on the mass has a magnitude of 5.00 N and is directed north. Determine the magnitude and direction of the force F1 acting on the mass

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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?”