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.
For an object moving in a straight line where there is no change of direction the acceleration is defined as the rate of change of velocity with time. It is given by the following equation. Two cars could be travelling with the same speed of 100 km/h on a motorway.