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A 74.0 kg firefighter climbs a flight of stairs 12.0 m high. How much work is required?

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W = Mg

M = 74 kg
g = 9.8 m/s^2

W=Force x displacement x cos of the angle.
W=(mg)(d)(cos angle)
W=(74 x 9.8)(12)(cos 0)
W=(725.2)(12)(1)
W=8702.4 J

Ok, i was thinking the similar way but i got confused because there was no time given neither speed.

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