An engine is attached to a wagon through a shock absorber of length 1.5m. The system with a total mass of 40,000 is moving with a speed of 72kmh -1 when the brakes are applied to bring it to rest. In the process of the system being brought to rest, the spring of the shock absorber gets compressed by 1.0m. If 90%of energy of the wagon is lost due to friction, the spring constant is .......x10 5 N/m
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