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.
Acceleration is a change in velocity. The change can be in direction only (such as centripetal acceleration during uniform circular motion). Under these circumstances, velocity is changing but speed is not. So constant speed does not imply zero acceleration.