A rocket fired from its launching pad not only picks up speed, but its acceleration also increases significantly as firing continues. Why is this so? (Hint: About 90% of the mass of a newly launched rocket is fuel.)
I would think because as the rocket continues firing, it’s converting the fuel into kinetic energy, propelling it upwards while at the same time the fuel is burning which is reducing the mass of the rocket. F=ma so if the force is increasing and the mass is decreasing, the acceleration is increasing also.