<P> The metre per second squared is the unit of acceleration in the International System of Units (SI). As a derived unit, it is composed from the SI base units of length, the metre, and time, the second . Its symbol is written in several forms as m / s, m s or m s, or less commonly, as m / s / s . </P> <P> As acceleration, the unit is interpreted physically as change in velocity or speed per time interval, i.e. metre per second per second and is treated as a vector quantity . </P> <P> An object experiences a constant acceleration of one metre per second squared (1 m / s) from a state of rest, when it achieves the speed of 5 m / s after 5 seconds and 10 m / s after 10 seconds . </P>

Why are the units of acceleration m/s2