The graph describes a bicycle racer's distance from a roadside television camera 1000 's(1) a) When is the bicyclist's velocity the greatest? How can you tell? (100,824) 800 b) Is the bicyclist's acceleration positive or negative? How can you tell? 600 Distance (in meters) 400 200- (10 208) 20 40 60 30 100 120 Time (in seconds) a) The velocity is greatest at time because the slope of the tangent line is there. b) The acceleration is because the slopes of the tangent lines