how tall is the building if the stone is in the air for 3 seconds?

Question

a stone is thrown upward from the top of a building at 25 degree angle to the horizontal with an initial speed of 15 m/s. if the stone was in the air (free falling?) for 3s how tall is the building?

Answer 1

x=vo t-1/2gt^2 where vo is the upward component of the initial velocity and g is the gravitational acceleration. x will be negative because the ground is below the initial position at the top of the building.