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Spring constant of the spring

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A 1200 kg car rolling on a horizontal surface has speed v = 66 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 3.3 m. What is the spring constant of the spring?

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The solution calculates spring constant of the spring.

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v= 66 km/h= 18.33 m/s
mass=m= 1200 Kg
KE=Kinetic energy=1/2 ...

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