How much work is done by a crane that lowers 1000N of material a distance of 150

Since workdone is Force times distance Given force-1000n Distance-150 Wd-1000 times 150 Wd-150000n.

The crane does NO work.

Work = (force) x (distance)

= (1,000 N) x (150 meters?) = 150,000 joules

But the work is in the direction of the force, and it isn't the crane

pushing the material down. It's gravity.

Gravity is doing the work.

If the material was being lowered by a cable wrapped around the shaft

of an electric generator, then you could use the work done by gravity to

generate some electrical energy, and then sell the energy.

Or, if the "material" happened to be water, you could let gravity lower it

through a turbine or a water wheel, and use the work done by gravity to

grind wheat.

Yes, the crane may be raising a sweat, working against gravity. The

purpose is only to prevent gravityfrom doing the work too fast.