When we say that two objects have relative motion， we mean （）.
举一反三
- what we mean when we say free writing?()
- When we say that we see light at the end of the tunnel, we mean that victory is __________.
- When we say, ‘no sweat, no sweet’, we mean ‘no pain, no gain’.
- When we say that we see light at the end of the tunnel, we mean that victory is ____. A: in light B: in sigh C: in sight
- When we choose two different reference frames to analyze the motion of an object, the description of motion can be different.