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    RE part A)

    How would you know the answer without calculating the kinetic energies before the crash and after the crash?


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    In a perfectly inelastic collision, the two colliding bodies stick together. Given that the two vehicles in your example stick together, it must be an inelastic collision.
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    (Original post by The.Doctor)
    In a perfectly inelastic collision, the two colliding bodies stick together. Given that the two vehicles in your example stick together, it must be an inelastic collision.
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