**Ballistics Cart**

Here we are interested in observing horizontal and vertical velocities. Note
that vectors which are mutually perpendicular have no influence on each other.

Questions:

1. Run the simulation with the tunnel. Observe the vertical velocity of the
red ball. Does the vertical velocity appear to be constant?

2. Run the simulation again with the tunnel. Does the horizontal velocity of
the ball appear to be constant?

3. Now run the simulation showing velocity vectors. Does the horizontal velocity
appear to be constant?

4. Now run the simulation again showing velocity vectors. Does the vertical
velocity appear to be constant?

5. Does this simulation appear to verify or contradict the statement about mutually
perpendicular vectors made at the top of this assignment?