You are using high-speed motion pictures at 3200 frames/second to analyze a projectile launched from a toy gun at a nearly vertical angle. The projectile has 20 g and is 5 cm long. You generate the graph shown below using data from the motion pictures. From the graph, when is the acceleration of the projectile zero? 

Examine the graph provided below, which portrays the velocity of a racebike as a function of time. Determine whether there are any periods during which the racebike encountered uniform acceleration.

The velocity-time graph below illustrates the motion of an aeroplane. Determine the time at which the magnitude of the aeroplane's acceleration was greatest.

The velocity-time graph for a body starting from rest is shown below. Determine if there is any turning point for this moving body.