Which is most useful in classifying stars? A. knowing the apparent magnitude of a star
B. knowing the color and brightness of a star
C. knowing the size of a star
D. knowing the movements of a star

the answer would be a

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.