1. The problem statement, all variables and given/known data Hooke's law describes a certain light spring of unstressed length 33.0 cm. When one end is attached to the top of a door frame and a 8.80 kg object is hung from the other end, the length of the spring is 46.50 cm. (a) Find its spring constant. (639.4667N/m) (b) The load and the spring are taken down. Two people pull in opposite directions on the ends of the spring, each with a force of 170 N. Find the length of the spring in this situation. 3. The attempt at a solution For the part B, the spring with two 170N at both end should be equal to 340N at one end and the other end fixed. since the K = 639.4667N/m F=kx 340 = (639.4667)x x = 0.531m then the total length should be 0.33m + 0.531m isn't? but my answer is wrong =( 1. The problem statement, all variables and given/known data A light spring with force constant 3.25 N/m is compressed by 5.00 cm as it is held between a 0.300 kg block on the left and a 0.600 kg block on the right, both resting on a horizontal surface. The spring exerts a force on each block, tending to push them apart. The blocks are simultaneously released from rest. Find the acceleration with which each block starts to move, given that the coefficient of kinetic friction between each block and the surface is the following values. Let the coordinate system be positive to the right and negative to the left. 3. The attempt at a solution I don't understand why we could assume the spring forces apply on both blocks are equally the same?