given that Diego drops his camera as he climbs a hill and it falls to the ground 256 feet below the distance D.
to solve the time it hit the ground, use the given equation
D = 16t^2
t^2 = d /16
t = sqrt( d / 16)
t = sqrt( 256 / 16)
t = 4 second
after 4 s the diego's camera will hit the ground
