I have just started a Physics class after having been away from algebra and equations for quite awhile. This is probably a very silly, elemenetary question, but here goes: With falling objects, I understand that g=10m/s2 and I know the formula that is used, however, I am working with only one number (the height of 300m) to find how long and how fast,and I can't figure out how to plug one number into the formula. I think that the t=30.0s and v=300m/s and if that is correct I don't know how to do the work to get there. I know this is easy, but I am missing something. Can anyone help? Thank you.