One ball rolls along a shelf at a steady rate. a second ball rolls off the shelf and gains speed as it falls in a curved path. which must have an unbalanced force acting on it?

false

because it does not have the potential to be entirely used up

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.