A simple spring is used to measure force. The spring is considered to be linear, so that $F=kx,$

where $F$ is the force in newtons. $k$ is the spring constant in newtons per centimeter. and $x$ is the

displacement in $cm.$ If $x=20\mathrm{.}0+-1\mathrm{.}25cm$ and $k=800+-16\frac{N}{c}m,$

Calculate:

The uncertainty of the measured force.

What is the maximum possible error?