Ameter stick is hung from a string tied at the 25cm mark. a 0.50-kg object is hung from the zero end of the meter stick, and the meterstick is balanced horizontally. what is the mass of the meterstick? (a) 0.25kg, (b) 0.5kg (c) 0.75kg (d) 1.0 kg (e) 2.0kg (f) impossible to determine