Question

how does a rocket go upwards

Answer 1

When a plane flies at steady speed, the forward thrust made by the engines isequal to the air resistance (drag) pulling back. ... With a rocket, thrust from the engines pushes upward while weight and drag try to pull it back down. When the rocket acceleratesupward, the thrust is greater than the combined lift and drag.

Answer 2

Because the gases left from the bottom of the rocket put force downwards and hence the rocket goes upwards.