
Joseph G. answered 08/26/22
Graduate Student and Substitute Teacher / B.A. in Chemistry (3.85 GPA)
Use the equation x = 0.5at2 where x is the displacement or change in distance.
After substituting values, you get: 30 = 0.5(2.1)t2
Then solve for t: t = √(30/0.5/2.1)