posted by orpheus .
A class is learning about acceleration due to gravity. Their plan is to climb a ladder and drop different kinds of balls from the same height at the same time. They will repeat this for ten trials, recording the data after each test. A video will be made of the activity to verify the results.
What is the independent variable in this experiment?
A. the size and type of the balls
B. the speed at which the balls fall
C. the number of balls that are dropped
D. the height from which the balls are dropped