1. The problem statement, all variables and given/known data A spring sticks up from the bottom of the sink, 0.20[m] long ; when a light (ρ=750[kg/m³]) wood block (0.2[m,x]×0.2[m,y]×0.1[m,z]) is attached on top of it, the spring becomes 0.05[m] long. 2. Relevant equations mass density = mass / volume Fspring = -ks 3. The attempt at a solution a) weight of block = 3kg stiffness of spring??? b & the others.. ??