Which of the following is not in uniform circular motion? CD in a CD player spinning at 45 rpm orbiting satellite that speeds up near the earth and slows down far away jet fighter making a high-speed loop at 600 m/s merry-go-round that is 10.0 m in diameter and rotating at 2 rpm

A uniform circular motion can be defined as the movement or motion a body that is in circular path and it must be in constant speed. The direction of motion of such a body can be known by taking tangent at its every position.

Now according to given options:

CD in a CD player in spinning at a constant speed and motion is circulatory. So it is in uniform circular motion.
The speed of satellite is varying with respect to the distance from earth, so it is not in uniform circular motion.
The speed of jet fighter is also given (constant), So it is also in uniform circular motion.
Merry-go-round has constant rotations per minute so it will also be in uniform circular motion.

I hope it will help you!