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What is the potential energy of a box in (ft)(lbf), kept on a wall having a height 20 ft above the surface? Assume that the mass of the box is 100 lb.

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What is the potential energy of a box in (ft)(lbf), kept on a wall having a height 20 ft above the surface?  Assume that the mass of the box is 100 lb.

(a) 1000

(b) 2000

(c) 3000

(d) 4000

This question was addressed to me at a job interview.

I want to ask this question from Conversion of Units-I in portion Introductory Concepts of Chemical Process Calculation

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Correct answer is (b) 2000

Explanation: PE = mgh, g = 32.2 ft/s2.

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