What does M/#s^2# measure?
I assume you mean
That is the measurement of acceleration. It is derived from the distance divided by the time - squared (also read as "per second per second).
This is because acceleration does not measure velocity. Instead, it measures the changes of speed in a time interval, typically in seconds.
The acceleration can be calculated by this formula:
I won't go too far into acceleration because that's not what you're asking, but I hope the information I provided answers your question!
Hope this helps :)