AUTHOR'S NOTE
I was unhappy with the unfinished Math::Calc::Units; but I was
happy with Math::Units. I felt that there should be a perl
module that handles units in a human readable way.
-Paul
SYNOPSIS
use Math::Units::PhysicalValue qw(PV);
my $exit = PV "10,000 ft";
my $open = "3500 ft";
my $delay = "43 s";
my $dist = $exit - $open;
my $rate = $dist / $delay;
my $weight = "180 lbs";
my $momentum = ($weight * ( ($exit - $open) / $delay )) + "0 kg*m/s";
print "$momentum\n"; # prints 3,761.82 kg*m/s
print ($rate + "0 miles/hour"), "\n" # prints 103.07 miles/hour