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 experiment's design? (1 point)
O The windows are not high enough to show significant differences in drop times.
O The drops are not repeated.
O It does not include objects with different masses.
O It does not include objects with different shapes.