U1!) 1U.U pomts A 0.55 kg rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle 51 above the horizontal. Due to gravity, the rock strikes the ground at a horizontal distance of 19.7 In from the base of the building. How tall is the building? Assume the ground is level and that the side of the build- ing is vertical. The acceleration of gravity is 9.8 I'D/S2 . Answer in units of In