#### Answer

$168\pi$ m per min

#### Work Step by Step

The formula for linear speed is $v=r\omega$ where $r$ is the radius and $\omega$ is the angular speed.
The formula for angular speed $\omega$ is $\omega=\frac{\theta}{t}$. Since the point on the edge of the flywheel rotates 42 times each minute,
$\omega=\frac{\theta}{t}=\frac{2\pi\times42}{1}=84\pi$ radians per min
Substituting the values of $r$ and $\omega$ in the formula for linear speed:
$v=rw=2(84\pi)=168\pi$ m per min