Fri July 27, 2012 By:

Mam,How does the velocity and acceleration point to opposite directions when speed decreases.

Expert Reply
Sat July 28, 2012
Speed and velocity are both vectors.
Speed is the rate of change of displacement with time and acceleration is the rate of change of velocity with time.
Thus when the speed decreases, even when it is still positive, i.e the body is moving in forward direction, the acceleration would be negative, as the velocity is decreasing.
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