How do you calculate the acceleration due to gravity? When the acceleration and velocity have positive signs, so that the speed (the magnitude of the velocity) is decreasing, we refer to a deceleration. When it is moving downward with negative velocity, it can accelerate downward with negative acceleration and move slower. In example, an elevator moving upward (which we take to be the direction of positive velocity ) cane accelerate upward with positive acceleration and move faster or accelerate downward with negative acceleration and move slower.
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