Force and Motion Concepts Quick Check 4 of 54 of 5 Items

Question
What is the fastest motion that can be measured in any frame of reference? (1 point)

186,000 m/s
186,000 m/s

300,000 m/s
300,000 m/s

186,000 km/s
186,000 km/s

300,000 km/s

Two people are on a train that is moving at 10 m/s north. They are walking 1 m/s south relative to the train. Relative to the ground, their motion is 9 m/s north.

Why are we able to use these motions to describe the motion relative to the ground?

(1 point)

If one object is moving much slower than the speed of light, its speed can be added to that of another object.
If one object is moving much slower than the speed of light, its speed can be added to that of another object.

The motion of everything in the Universe besides light can be described in this way.
The motion of everything in the Universe besides light can be described in this way.

As long as the frame of reference is stationary, all motion can be described in this way.
As long as the frame of reference is stationary, all motion can be described in this way.

The people are moving much slower than the speed of light so the ground acts as a frame of reference.