3. Two industrial spies sliding an initially stationary 225 kg floor safe a displacement å of magnitude 8.5m. The push F₁ of spy 001 is 12.0 N at an angle of 30° downward from the horizontal; the pull F₂ of spy 002 is 10N at 40° above the horizontal. The magnitude and directions of these forces do not change as the safe moves, and the floor and safe make frictionless contact. (a) What is the net work done on the safe by forces F₁ and F₂ during the displacement d? (b) What is the work done on the safe by the gravitational force and work done on the safe by the normal force from the floor? (c) The safe is initially stationary. What is the final velocity at the end of the 8.50 m displacement? Spy 002 Spy 001

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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?”