Abasketball player can jump upwards with a velocity of 3m/s. how long is she in the air before coming back to the ground? i need the info with the units.

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

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?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?