1. The problem statement, all variables and given/known data A 15.0 g bullet with a speed of v = 235 m/s is fired into a block of wood that is initially at rest on a frictionless surface. The block of wood is attached to a horizontal massless spring with a spring constant k = 195 N/m that is initially uncompressed. The other end of the spring is attached to a wall as shown in the figure below. The bullet becomes imbedded in the block of wood which then compresses the spring a distance of 28.0 cm before momentarily coming to a stop. a) Determine the mass of the wooden block. b) What fraction of the kinetic energy is transformed into other forms of energy during the inelastic collision of the bullet with the wooden block? 2. Relevant equations 3. The attempt at a solution for a) is it like this: kx = 1/2mv^2 k=195 x = 28cm m = m of bullet + M of block v = initial speed and then solve for M kx = 1/2(m + M)^2. And 2nd question i dont know how to start.