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A 3kg mass moving initially to the right along the x axis with a speed of 8m/s makes a perfectly inelastic collision with a 5kg mass initially at rest at the origin.what fraction of the initial kinetic energy of the system is lost in the collision.what formula must i use.

  • Physics - ,

    The masses stick together so have the sum of masses and the same velocity after collision:

    3*8 = 8 * v
    v = 3 m/s after

    Ke before = (1/2)(3)(64)

    Ke after = (1/2)(8)(9)

    answer = ( Ke before - Ke after)/Ke before

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