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Question 81

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A mass of 0.50 kg is attached to a massless spring with a spring constant k = 600 N/m (see figure above) . The system rests on a level, friction-free surface and is initially at rest. A second mass of 0.20 kg makes an elastic head-on collision with the mass attached to the spring; thereafter, the oscillating system vibrates with an amplitude of 0.25 m. What was the incident speed of the second mass? A) 16 m/s B) 8.7 m/s C) 6.1 m/s D) 11 m/s E) 5.3 m/s A mass of 0.50 kg is attached to a massless spring with a spring constant k = 600 N/m (see figure above) . The system rests on a level, friction-free surface and is initially at rest. A second mass of 0.20 kg makes an elastic head-on collision with the mass attached to the spring; thereafter, the oscillating system vibrates with an amplitude of 0.25 m. What was the incident speed of the second mass?


A) 16 m/s
B) 8.7 m/s
C) 6.1 m/s
D) 11 m/s
E) 5.3 m/s

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