A hot air balloon is acted on by two forces. One force is its weight, equal to 2448 newtons. The second force is a buoyant force acting straight up,
equal to 2448 newtons. What change in the motion of the balloon will
result from the action of these two forces?
no change
rising
falling

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Arocket starts from rest and moves upward from the surface of the earth. for the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay = 12.80 m/s32t, where the +y-direction is upward. (a) what is the height of the rocket above the surface of the earth at t = 10.0 s? b) what is the speed of the rocket when it is 325 m above the surface of the earth?