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A mass of 0.5 kg is attached to a spring whose k=8000 N/m. The system rests...

A mass of 0.5 kg is attached to a spring whose k=8000 N/m. The system rests on a
level friction-free air track and is initially at rest. A second mass makes a head-on
elastic collision with the mass attached to the spring; thereafter the oscillating
system vibrates with amplitude of 0.5 m. If the incident mass is 0.4 kg, what was its
incident speed?

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