Unit seven lesson nine waves unit test 30 questions Janelle wants to know how fast his skateboard can roll down the ramp in front of his school so he places the back of the skateboard even with the top of the ramp and times how long it takes the front of the skateboard to reach the end of the ramp. After he records the time he performs this procedure again for more times, and calculates the average time During his experiment, what does Janelle demonstrate is the answer renovation regeneration, replication or repetition?