5. Two forces acting on an object, F1=30 N, F2=40 N. The angle between is 90°. To make the object move in uniform linear motion in the direction of F1, a force F3 must be applied. Find the magnitude of F3?

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Q: Find the mass M.

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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?”