How high was the ball thrown?: Application Experiment


Estimate how high the ball is thrown using two independent methods. Note: One method MUST involve kinematics

Prior Knowledge

  1. Kinematics

Description of the Experiment

A ball is thrown straight up. Use the video to figure out how high the ball is thrown via two independent methods. Remember to specify your estimate relative to some fixed point. Write down the procedures you are going to use.

Addtional Information

For one method there is a ruler in the picture to help you make and estimate. The ruler is 1.5m long and has a number printed every 20cm. For the second method, you should use kinematics. Notice that there is a frame rate provided next to the movie. It tells you how many frames the movie plays at. If the movie plays at 30 fps, then one frame is 1/30th of a second. You can get time by stepping frame by frame and counting the number of frames.

Youtube movies can be stepped frame by frame using the , and . keys on your keyboard. If you want to download the movie to your computer, right-click or control-click HERE.


Do your two estimates of the height agree? If not, why not? Which estimate do you think is more reliable?