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.

What is the potential energy of a box in (ft)(lbf), kept on a wall hav

1.	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
Answer» C.