In kinematics, acceleration is defined as the first derivative of velocity with respect to time (that is, the rate of change of velocity), or equivalently as the second derivative of position. It is a vector quantity with dimension L T. In SI units, acceleration is measured in metres per second squared (m/s).
***
This is a list of aliens stored within the fictional Omnitrix device in the American animated television series Ben 10 and its sequel Ben 10: Alien Force.
Fourarms vs Way Big, 
