Will mark brainliest! explain why a mechanical wave does not exist in a vacuum.

i hope this with your question .

acceleration has the dimensions of velocity (l/t) divided by time, i.e. l.t−2. the si unit of acceleration is the metre per second squared (m s−2); or "metre per second per second", as the velocity in metres per second changes by the acceleration value, every second.

a difference is that all the elements then make a compund and a similaritiy could be that the "compound" would include elements

the answer is c when more work was done, the couch was moved further.