As a rocket ascends, its acceleration increases even though the net force on it stays constant. Why? (Assume a traveling distance small enough that the thrust, acceleration due to gravity and atmosphere do not change.) As the rocket ascends, fuel is burned at a faster rate resulting in a larger acceleration.The rocket's mass decreases as its fuel is consumed. The same net force acting on a smaller mass results in a larger acceleration. The faster a rocket moves the more acceleration is imparted to it from a given force.As a rocket ascends its momentum increases with its speed. The greater the momentum of the rocket, the greater the acceleration imparted to it from a given force.

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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?”