Your mass is 63.4 kg, and the sled s mass is 25.0 kg. The sled is moving by itself on the ice at 3.19 m/s. You parachute vertically down onto the sled, and land gently. What is the sled s velocity with you now on it?     1.04 m/s     0.90 m/s     0.72 m/s     1.17 m/s

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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?”