A lightweight wooden stick has a length of 0.90 m. A 0.75-kg mass is attached to the left end of the stick, and an unknown mass m is attached to the right end of the stick. The stick and masses balance when the stick is suspended from a string attached 0.25 m from its left end. (a) Is m greater than, less than, or equal to 0.75 kg? Explain.
(b) Determine the mass m.