Question

The height of the Empire State Building is 318.00 meters. If a stone is dropped from the top of the building, what is the stone's velocity just before it strikes the ground? –1.75 meters/second –18 meters/second –79 meters/second –636 meters/second

Answer 1

D = 318 meters
vi = 0 m/s
vf =????
a = 9.81

Formula
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vf^2 = vi^2 + 2*a*d

Substitute and solve.
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vf^2 = 0^2  + 2 * 9.81 * 318
vf^2 = 6239.16
v = sqrt(6239.16)
v = 78.990 m/s I guess down is minus in your classroom.
Anyway pick -79 <<<<<=======