Question

marcus wants to test the effect of gravity on objects with different masses. he drops two footballs from a first - floor window, a second - floor window, and a third - floor window. in each case, he times how long it takes the footballs to reach the ground. what is wrong with his experimental design? (1 point) the windows are not high enough to show significant differences in the drop times. the drops are not repeated. it does not include objects with different masses. it does not include objects with different shapes.

Explanation:

Marcus wants to test the effect of gravity on objects with different masses. However, he uses two footballs. Footballs have the same mass. So, his experiment does not include objects with different masses.

Answer:

It does not include objects with different masses.