Tennis bouncing

 To celebrate Chrismas, Santa(Yufan) and I have a wonderful outdoor experiment about how many energy does the object lost during the collision.

On account of both Yufan and I fascinate tennis, we two decided to use the tennis as our object in the experiment.

material: a normal sized tennis ball(58.5g), wall, ruler, phone, timer.

First, we measure the 1 meter away from the wall as our start line where we push the tennis ball.

Then, we record the video and push the ball.

After all of these actions, we used logger pro to calculate the time the ball need to collide the wall and the time it went back to start line after the collision.

Data:
time spent before the collision: 2.15s.
time spent after the collision:4.3s.

use the equation V= d/t
Vi:1/2.15=0.465m/s
Vf:1/4.1=0.243m/s

the energy = 0.5*m*v^2
Ei=0.0063J
Ef=0.00173J

The energy lost: 0.00457J.
Sant and me.