Question

How much work would it take to push a `12 kg` weight up a `5 m` plane that is at an incline of `pi / 12`?

Answer 1

I got `153J`

Explanation:

We can use the fact that the work will be equal to the (Grav.) Potential Energy `U=mgh` gained in changing height. The only thing is that the height `h` will be the vertical height obtained from trigonometry as:

so that:
`h=5sin(pi/12)=1.3m`

Giving for Work:

`W=U=mgh=12*9.8*1.3=152.88~~153J`