What is the initial accelerationof a rocket that has a mass of 1.50×106 kg at takeoff, theengines of which produce a thrust of 2.00×106 N ? Do notneglect gravity. (b) What is unreasonable about the result?(This result has been unintentionally achieved by several realrockets.) (c) Which premise is unreasonable, or whichpremises are inconsistent? (You may find it useful to comparethis problem to the rocket problem earlier in this section.)

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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?”