3. Problem No. 3: A block of mass M=900 kg is lifted, via an arrangement of pulleys as shown. Determine the pulling force T for arrangements (a), (c) and (e). Include an FBD of each pulley separately. T (a) (b) O (d) F T (e)

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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?”