Question

a stone is dropped from the edge of a roof, and hits the ground with a velocity of -125 feet per second. how high (in feet) is the roof?

Answer 1

Answer: the acceleration of an object due to earth's gravity is 32 ft/sec2

Step-by-step explanation:

y = h - gt2/2 = 0; h = gt2/2; v(t) = dy/dt = - gt; t = - v(t)/g; h = g/2·v2(t)/g2 = v2(t)/(2g) = 1252ft2/s2/(2·32ft/s2) =

244.14 ft