The tallest man made structure at present is thewarszawa radio massin warsaw poland. this radio mast rises 646m above ground nearly 200m higher than the sears tower in chicago. suppose a worker at the top accidently knocks a hammer off the tower if the force acting on the hammer is 3.6n and its acceleration is 9.8m/s calculate the mass of the hammer. most show work

All of that fluff at the beginning is interesting, but completely irrelevant
to the question.  The question is just asking for the mass of an object
that weighs 3.6N on Earth.

                           Weight = (mass) x (acceleration of gravity)

                              3.6N = (mass) x (9.8 m/s²)

Divide each side
by  9.8 m/s :           Mass = 3.6N / 9.8 m/s² = 0.367 kilogram (rounded)