swimmers in Washington State jumped off of the railroad bridge into the river below. The swimmers stepped off th bridge and hit the water 1.5s later.
How high was the bridge?
How fast were the swimmers moving when they hit the water?
what would be the swimmer's drop time if the bridge were twice as high?

I can't answer these questions because I don't know how to divide or multiply something by 9.81m/s^2 hen they are on scales of m/s.

How do I do this?