Aperson drops a brick from the top of a building. the height of the building is 400 m and the mass of the brick is 2.00 kg. what will be the speed of the brick right before it touches the ground? use g = 10.0 m/s2

-- It takes the brick 8.9 seconds to reach the ground. 

-- At the instant of the "splat", it's falling at 89 m/s.

-- The mass doesn't matter. If not for air resistance, every object
    would fall at the same rate.  The answer is the same for a feather,
    a rubber chicken, a brick, or a school bus.