Pump the handle to add 400 gas molecules to the chamber. For finer adjustments of the number of gas molecules, use the Gas in Chamber window near the top right.

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

it is b that is the answer.