Recent content by jacknife

I got that by the work done in lifting the object plus the work done in lowering it back down mgΔh+mgΔh

Thats the first thing i did it gives weiping did 20 J and Bubba did 2 J but what confuses me is that the object is moving with a constant velocity so has some kinetic energy so shouldn't work done by bubba be the sum of the kinetic energy and the work done in moving the object?

i just realized that a moment ago edit :P

ok so if we assume the Gravitational field is constant and there is no friction then who did the greater amount of work? But if we assume there is no friction then a forward force of 1 N would cause the table to accelerate forward but it moves at a constant velocity so let's assume there is 1 N...

Isn't weight of an object force directed towards the center of the earth?

[Mentor's note: this post does not use the homework template because it was originally posted in a non-homework forum. It was moved here because it had already received some help.] ---------- Weiping lifts a rock with a weight of 1.0 N through a height of 1.0 m, and then lowers it back...