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A 800 kg car moving east at 31 m/s runs head-on into a 3100 kg truck moving west at 21 m/s. The vehicles stick together. Use

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W- m, 8ookg m2=3lookg 11 - 31 m/ = 21 m/s So, the velocity of centre of mass. v = 200 m, n, o m , r mitm, 800X31 - 3100X2 900so, loss of kinetic energy = 859.74x1035

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