Question

How much work would it take to push a `4 kg` weight up a `5 m` plane that is at an incline of `pi / 4`?

Answer 1

It takes `138.7J`

Explanation:

First of all we have to find the value of `h`, the variation in altitude.
We use trigonometry: `h=5m*sin45°=3.5m`
To find work we use the equation `W=mgh=4kg*9.81m/s^2*3.5m=138.7J`