The rock takes a much different amount of time each drop.
The rock takes the same amount of time each drop.
The rock takes more time each drop.
The rock takes less time each drop.
Listen to the ideas of others and share your own ideas.
Leave and go work with another group.
Ignore their ideas because they might confuse you.
Decide not to do the experiment because you have different ideas.
Decide not to do the activity at all.
Do your best to measure the objects.
Ask someone else to do your job.
Just skip the measuring.