How long was Michael Jordan in the air when he jumped straight up with a speed of 4.5 m/s? I know the answer is 0.918 seconds, but I don't know how to get there.

Explanation:

Using the equation of motion

v = u+gt

v is the final velocity

u si the initial velocity

g is the acceleration due to gravity

t is the time

Substitute

0 = 4.5-(9.8)t

-4.5 = -9.8t

t = 4.5/9.8

t = 0.459s

answer: he got 23

explanation:

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )