half of the tacks must have a mass of 50 grams. so, I would expect all of the tacks to have a mass of 100g, and the mass of the box would be 20g.
How much does it WEIGH? .02*9.8 Newtons.
A box of tacks weighs 120 grams when full, when half full it weighs 70 grams. How many grams does the box weigh when empty?
2 answers
120 - 70 = 50
2 * 50 = 100
120 - 100 = ?
2 * 50 = 100
120 - 100 = ?
2 answers