Which of these four is the most massive?

How do you know?

What is happening to change the velocities of the objects?

Write 3-4 sentences that describes what might be happening.

What is indicated by the differences in the graphs of the four objects?

Can you determine the velocity of each object by looking at the graph?

If all of the smaller spheres have the same mass, which has the greater force acting on it?

Are there any surprises regarding the velocities of the spheres?