Calculating with W=Fs

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Background

Energy is the ability to do work. Work is a defined concept that can serve as an energy common denominator. Work is defined by the following equation:

Work = (Force)(Distance) or W=Fs
Joules = (Newtons)(Meters)

Textbook Discussion: Sections 7.3, pages 212. See Also: Example I and II, pages 213, and 214.

Problem

A 65.1 kilogram mass has a weight of 638 newtons (about 145 pounds). If this mass is lifted 87.3 meters above the surface of the earth, how many kilocalories of gravitational potential energy will be stored in the weight with respect to the earth surface? Given: 4.18 J/cal