It is necessary to choose a single frame of reference when measuring motion because c<span>hoosing a meaningful frame of reference allows you to describe the motion in a clear and relevant manner.
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
</span>
Answer:
3
Step-by-step explanation:
cause i wrote it on paper tho
Hello,





I don't know what i have to do for the last one.
Hope this helps !
Photon