image from here
The
next
thing you do at the airport is you have to check in. The
first thing you
do when you check in is to check-in your bags. Lifting bag
take a lot of work
to pick up. If we use a 10 kg bag and lift it 1 meter and
the gravity is 10m/s^2,
we can use the equation work=mass*gravity*distance and we
would find that the
work would we would use would be 100 joules to lift the bag
up.