an egg parachute was drop at a building with a time of 7.57 sec. what is the height of the building and velocity.
Right off, I'd say the building has zero velocity.
as for time to fall,
h - 4.9t^2 = 0
plug in t= 7.57
as for time to fall,
h - 4.9t^2 = 0
plug in t= 7.57