# How much work does it take to raise a 7 kg  weight 15 m ?

Dec 10, 2015

It takes $\text{1000 J}$ of work.

#### Explanation:

$\text{Work"="Force" xx "Distance}$

The force in this problem is the weight of the body being raised in Newton's, using the equation $\text{F"_"weight"=mg}$, where $\text{g}$ is $\text{9.81 m/s"^2}$.

$\text{F"_"weight"=7"kg"xx9.81"m/s"^2"=68.67 N}$

I am keeping some guard digits to reduce rounding errors. The final answer will be rounded to one significant figure.

$\text{Work"=68.6"N"xx15"m"=1000 N*m=1000 "J}$