012 (part 1 of 4) 10.0 points A massless spring with force constant 232 N/m is fastened at its left end to a vertical
wall, as shown below. The acceleration of gravity is 9.8 m/s. Initially, the 6 kg block and 3 kg block rest on a horizontal surface with the 6 kg block in contact with the spring (but not compressing it) and with the 3 kg block in contact with the 6 kg block. The 6 kg block is then moved to the left, compressing the spring a distance of 0.8 m, and held in place while the 3 kg block remains at rest. Determine the elastic energy U stored in the compress
74.24

(part 2 of 4) 10.0 points
The 6 kg block is then released and accelerates to the right, toward the 3 kg block. The surface is rough and the coefficient of friction between each block and the surface is 0.5. The two blocks collide, stick together, and move to the right. Remember that the spring is not attached to the 6 kg block. Find the speed of the 6 kg block just before it collides with the 3 kg block. Answer in units of m/s.

014 (part 3 of 4) 10.0 points
Find the final speed of both blocks (stuck
together) just after they collide.
Answer in units of m/s.

015 (part 4 of 4) 10.0 points
Find the horizontal distance the blocks move
before coming to rest.
Answer in units of m.