If an object's [[acceleration]] and velocity have the same sign, the object is gaining [[speed]]. If acceleration and velocity have different signs, the object is losing speed.
If an object's [[acceleration]] and velocity have the same sign, the object is gaining [[speed]]. If acceleration and velocity have different signs, the object is losing speed.
+
+
If velocity is [[zero]], [[acceleration]] is not necessarily zero. If acceleration is zero, velocity is not necessarily zero.