A 0.44-kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one, and the amount that the spring stretches from its unstretched length triples. What is the mass of the second block?
1 answer
because length is proportional to force, the second set of masses must be three times the first, but the second set of masses is .44kg+secondmass, so second mass is twice the first.