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An automobile has a mass of 2150 kg and a velocity of +18 m/s. It makes a rear-end
collision with a stationary car whose mass is 1850 kg. The cars lock bumpers and skid
off together with the wheels locked. What is the velocity of the two cars just after the

  • physics -

    momentum is conserved, so

    2150*18 + 1850*0 = (2150+1850)v
    solve for v

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