In the experiment described in the scenario, what’s the variable?

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )