What type of machine is a CD player? simple machine mechanical machine compound machine complex machine

Compound machine

Explanation:

I know this because a compound machine contains several simple machines and that is what a CD Player has.  Hope this helps!

For eintein's frame of reference, both beam travel at the same speed.

For my own frame of reference, both beams travel at the same speed.

Explanation:

According to special relativity, the speed of light is the same in all direction on all reference frame. If not for this law we will assume the from beam will have a relative speed that will be the speed of light plus the speed of the fright car. This is not so and it violates the speed limit of light which according to the first law is the highest speed possible and nothing can go beyond that.