Test Review

In my calculus test I did a pretty horrible job with it. I made a silly mistake by confusing velocity and speed. I forgot that it was only speed that can't be negative. So in my free response, I only added the positive answer and ignored the negative, making me lose points. I learned that in a graph, the acceleration of a particle is zero when the graph goes completely horizontal and there in no tangent line in the velocity graph. I am still having a bit of trouble with graphing the acceleration in respect to time when given the graph of the velocity in respect to time.