Question

Explain Newton's third law of motion applies to the upward force and the rocket and due to force on the hot gases

Answer 1

The hot exhaust gas flows through the rocket nozzle and is accelerated to the rear of the rocket. In re-action, a thrusting force is produced on the engine mount. The thrust accelerates the rocket as described by Newton's  second law of motion. The reaction, or motion, of the rocketis equal to and in  the opposite direction of the action, or thrust, from the engine (third law).