A 0.99 kg rock is projected from the edge of the top of a building with an initial velocity of 6.45 m/s at an angle 45◦ above the horizontal. Due to gravity, the rock strikes the ground at a horizontal distance of 10.3 m 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 m/s2 .
Answer in units of m.
this is physics
