Question

The crew men in space are discussing whether they can crack a wall nut with a hammer.
Man A says that hitting wall nut with a hammer would be no more effective than hitting it
with a feather. Because the hammer is weightless in space. Man B says that he found mass
of the hammer to be about 1kg by comparing it with known masses on a equal even
balance or mass balance. He could break the wall nut as easily has back on earth. Man C
maintain the comparison with the masses proved nothing because out in space these two
are weightless. Can they crack the wall nut? Comment on the statements of the crew men.