Question

Mrs. Jacobs dropped an object from 10 meters. She knows it did 50 joules of work. How much did it weigh?

Answer 1

`0.51kg`

Explanation:

Work = force x distance (simplest form)
Force in this case would be gravitational force, which is mass x gravitational field strength.
But let's find out the force first. Since the object travels in the parallel direction to the force, we can disregard `costheta`.
`50=F*10`
`F=5N`
Then:
`F=mg`
`5=m*9.8`
`m≈0.51kg`