Question

012 (part 1 of 4) 10.0 points A massless spring with force constant 277 N/m is fastened at its left end to a vertical wall, as shown below. The acceleration of gravity is 9.8 m/s 2 . Initially, the 8 kg block and 3 kg block rest on a horizontal surface with the 8 kg block in contact with the spring (but not compressing it) and with the 3 kg block in contact with the 8 kg block. The 8 kg block is then moved to the left, compressing the spring a distance of 0.3 m, and held in place while the 3 kg block remains at rest.Determine the elastic energy U stored in the compressed spring. Answer in units of J.0.3 m 3 kg 8 kg277 N/m 3 kg 8 kg

013 (part 2 of 4) 10.0 points The 8 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 0.3 . The two blocks collide, stick together, and move to the right. Remember that the spring is not attached to the 8 kg block. Find the speed of the 8 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.

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