Two men arc moving a heavy metal box with a mass of 225 kg from an initial position to one that is 8 m away towards the right. The man on the left of the box pushes the box with a force of 12 N at angle 30° downward from the horizontal while the man on the right of the box pulls it with a force of 10 N 40° above the horizontal. The forces exerted by both men are constant. What is the net work (Wnet) the men exert on the box?

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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?”