Question

How much work does it take to raise a `5 kg` weight `42 m`?

Answer 1

The work done against gravity is 2060 J

Explanation:

If we only consider work done against gravity we need to use this formula where `W` is the work done, `F` is the weight of the object and `d` is the height through which the object is lifted:
`W=Fd`

The weight of the object is given by:
`w = mg`

So then we combine our equations to give:
`W = mg * d`
Otherwise written as `W = mgDeltah` (this is the gravitational potential energy equation).

Now substitute values to solve for `W`:
`W = 5 × 9.81 × 42 = 2060 J`