In science class we did an experiment with a tennis ball to see if the speed stays the same and if the velocity changes. To figure this out we dropped a ball by a measure on the wall with a strobe light so we could see how far the ball was dropping and if it was going faster with a camera. The speed increased greatly, 9.81 meters per second velocity increased also. by using the strobe light it allowed light to enter the camera at different times showing how far the distance of the ball increases.
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