A4.22 kg briefcase is sitting at rest on a level floor. what is its weight in newtons

The briefcase weighs 41.4 Newtons. It doesn't matter whether the briefcase is at rest or excited or on the floor or on the table or under water or floating in chicken soup or hanging from the end of a string or dropping from an airplane. If it's anywhere near the Earth its weight is 41.4 Newtons.

By dividing you can find the answer

A. they hold atoms  together with a molecule.its a force that exist between molecules. hope this .