a group of physics students performs an experiment to test the effect of gravity on different objects with the same mass they measure how long it takes the objects to fall from the top of the schools bleachers how can they insure they get accurate data
by using a high tech stop watch
by dropping the objects in random order
by dropping all the objects at once
by repeating the experiment several times
by making sure the objects are released from the same height each time
by making sure the objects have the same mass
by making sure the objects are dropped in a vacuum
by making sure the objects are dropped in the same temperature and air pressure