A massless spring with force constant 602 N/m is fastened at its left end to a vertical wall, as shown below. 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 0.6 m, and held in place while the 3 kg block remains at rest as shown below. The acceleration of gravity is 9.8 m/s²
C) Find the final speed of both blocks (stuck together) just after they collide. Answer in units of m/s?