Velocity Graph Slowing Down. But the graph is concave down the acceleration is negative the thing is slowing down until it reaches velocity and speed 0 at time 1. Slowing down away from the origin and then speeding up towards from the origin.
Notice that a line sloping downwards - with a negative gradient - represents an object with a constant deceleration it is slowing down. It can be turning or changing. And when the velocity graph is decreasing the acceleration is negative.
Technically since velocity and acceleration are vectors they cannot be denoted as positive or negative.
During straight line motion a negative velocity means the object is moving backwards. And when the velocity graph is decreasing the acceleration is negative. Slowing down away from the origin and then speeding up towards from the origin. During straight line motion a negative velocity means the object is moving backwards.
