The figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes 0.64 s for it to reach the floor. What is the mass  m of the block on the left? There is no friction or mass in the pulley, and the connecting rope is very light.

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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?”