A massless spring with force constant k = 4.0 x 10^2 N/m is fastened to a a wall as shown in the diagram above. Two blocks are placed against (not attached to) the spring in its uncompressed length. The spring is then compressed by pushing block C (m = 4.0 kg) to the left by 0.50 m, whereas block D (m = 2.0 kg) remains at its original location. a. Determine the elastic energy stored in the compressed spring. Block C is then released and accelerates towards D. Note the coefficient of kinetic friction between the surface and each block is 0.40. b. Determine the speed of block C just before it collides perfectly inelastically with block D.  c. Determine where the blocks will come to rest.

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