ancillae. 1  nominative plural of. 2  genitive singular of. 3  dative singular of.  vocative plural of.
Acceleration is the time rate of change of velocity. If velocity is constant, then. acceleration is zero. Note: 100 km per h for 10 seconds is a constant speed, but not necessarily a constant. velocity, since we're told nothing about the direction.
A mathematical definition for acceleration is the velocity rate of change (its derivative). In the real world is easy to concretize the idea if you think in a car moving. If you accelerate/break, the speed will change positively/negatively. In the physical world, acceleration is the effect of applying forces in bodies.