A young woman is standing on a bridge overlooking a river. If she drops a rock from the bridge, and it takes 1.2 seconds for it to hit the r

We have the position at any time is given by

P = -9.8t^2 + v₀t + h      where v₀ = 0.... and let P = 0 when it hits the water.....so we have

0 =-9.8t^2 + h    and at 1.2 sec, we have

9.8(m/s^2)(1.2 s)^2  = h  = about 14.1 m

http://www.flashcardmachine.com/module-9an-introductiontothephysicsofmotion.html

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Thanks anon for that flash card site.  It looks like it could be really useful for students.

Do you use it yourself or did you just google this question?