1. The problem statement, all variables and given/known data A block of mass 1.5 kg is placed against a horizontal spring of force constant k that is compressed .20 m. the spring is then released and the block travels to the right along a horizontal surface. The coefficient of kinetic friction between the block and the surface is 0.4. After the block has traveled 0.9 m to the right, measured from its initial position against the compressed spring, its velocity is 14.5 m/s. Calculate the force constant k of the spring. 2. Relevant equations Kinetic/gravitational/elastic/friciton (Usage varies for different situations. 3. The attempt at a solution [0+0+Es] Initial = [K+0+0+Ef] 1/2kv^(2) = 1/2mv^(2) = uNd N=fg=mg so this replaces N essentially! plugging in... 1/2k(0)^(2) = 1/2(1.5)(14.5)^(2) + (.4)(1.5)(9.8)(.9) k=320.667 k=321 Nt Is this correct? Just needing full proof assistance thank you so much.