a test rocket is falling downward at a constant speed (however, it is acceleration in the horizontal direction). it is attached to a parachute with tension 980 N applied at an angle feta=64 degrees. draw a force diagram of all the forces acting on the rocket.  what is the mass of the rocket? what is the acceleration of the rocket in the x direction?

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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?”