Question

Find the work done lifting a 290-pound weight 28 feet in the air.

Answer 1

Answer: The correct answer is 8120 foot-pound.

Explanation:

The expression of work done in terms of mass and height is as follows;

W= mgh

Here, m is the mass of the object, g is the acceleration due to gravity and h is the height.

It is given in the problem that the work is done in lifting a 290-pound weight 28 feet in the air. Here, the work done is equal to the potential energy.

Calculate the work done.

W= mgh

Put mg=290-pound and h= 28 feet.

W= (290)(28)

W= 8120 foot-pound

Therefore, the work done is 8120 foot-pound.

Answer 2

The work may be calcualted as the differential of potencial energy or as the product of the force x the distance. The result is the same.

T = weight x height

T = 290 pound * 28 feet = 8120 foot-pound