# How much work does it take to raise a 7 kg  weight 2 m ?

For gravitational potential energy, we have $U = m g h$ where symbols carry their regular meanings.
In this case we have, $m = 7 k g , h = 2 m$ and $g = 9.81 m {s}^{- 2}$.
Thus, $U = 7 \cdot 2 \cdot 9.81 = 137.34 J$ which is equal to the work done to raise that object to that height.