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.
The basic idea is that you get in the car, it zooms up the vertical part of the track. 1  During both the going up and going down parts fo the motion, the acceleration is -9.8 m/s2 so you feel weightless. Let me summarize so far: 2  In all these situations, the gravitational force does not change.