Requesting Math Help/Feedback for my Web Page

Although here the units don't match (day vs century) that can be easily corrected by converting either to the other so they match.But dwise1 is only writing out the long way what can be considered an "acceleration."For example:
9.8 m/s^2 = 9.8 meters per second per secondExcept, if these are all 'slowing down' then, really, it should be a deceleration and therefore have a negative sign in front of it.Other than that, I didn't really get into the actual maths