Part C: Conservation of Energy in Projectile Motion 9. Go to https://phet.colorado.edu/en/simulation/projectile-motion. Choose the 'Lab' simulation and leave all parameters at their default values. Fire the cannon. Note that you can drag the bullseye attached to the blue box to any point along the projectile's trajectory to measure the time, range, and height at that position. Also, remember that "range" always refers to horizontal distance traveled.

10. Here's a (very relevant) chapter 3 review question: Is the velocity at the top of the projectile's path purely vertical, purely horizontal, a combination of these, or zero?

11. Use your answer to the previous question to help you calculate the projectile's velocity at the top of its path.

12. Calculate the initial KE and PE of the projectile (at 0 seconds).

13. Calculate the KE and PE of the projectile at the top of its path.

14. Is energy being conserved here? Use the values you obtained in steps 12 and 13 to demonstrate this. If it doesn't appear to be conserved (or at least very close to it), I suggest revisiting your responses to steps 10 and 11!