How much work must be done to roll a metal safe, mass 116 kg, a distance of 15.0 m across a level floor? The coeffecient of friction is 0.050.

Answer 1

Work = Force * distance = m g mu X

Just multiply your three numbers together, along with g = 9.8 m/s^2. The answer will be in Joules.
"mu" is the coefficient of friction (0.05). It should be the Greek lower case letter, but I can't type it here.

Answer 2

852.6J