how did this formula come ?
"Net force in the upward direction is given as:

Upthrust Weight of the rocket = Mass × Acceleration"
ie., F = Upthrust Weight of the rocket ?

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Solution

Gases burning out at the rear of the rocket change the momentum of the rocket, this results in a force that gives the rocket an upward force. From Newton’s 2^nd law of motion force = mass × acceleration.
Now weight is sometimes used in place of force. Weight of a body is the gravitational force acting on it. Similarly, when the rocket experiences an upward force called upthrust; it can be said that the force is the upthrust weight.

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how did this formula come ?"Net force in the upward direction is given as: Upthrust Weight of the rocket = Mass × Acceleration"ie., F = Upthrust Weight of the rocket ?

how did this formula come ?
"Net force in the upward direction is given as:

Upthrust Weight of the rocket = Mass × Acceleration"
ie., F = Upthrust Weight of the rocket ?