Mathematics · Work, Energy and Power
An engine is attached to a wagon through a shock absorber. The system with a total mass of 40,000 kg is moving with a speed of 72 km/h when brakes are applied. In bringing the system to rest, the spring compresses by 1.0 m. If 90% of the kinetic energy is lost due to friction, the spring constant k is k × 105 N/m. The value of k is:
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