An Object of Mass $m$ Initially at Rest Is Acted Upon by a Single Force

Multiple Choice

An object of mass $m$ initially at rest is acted upon by a single force $f$ over a distance of $d$ . If the single force is the weight of the object, and the distance that the object moved was its original height $( d = h )$ , the final kinetic energy of the object is

A) $\mathrm { fh } / \mathrm { m }$
B) $\sqrt { 2 f h / m }$
C) $0$
D) $m g h$