An object attached to a rope is released from rest where the rope is in a horizontal position. At the lowest point in its swing, a bullet moving in the opposite direction hits the block and lodges deeply into it. As a result of this impact, both the bullet and the block are stationary. What is the magnitude of the bullet's velocity just befote hitting the block? Take the mass of the block to be 2.0 kg, the mass of the bullet to be 8.0 g and the length of the rope to be 1.8 m.

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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?”