Physics

Two objects, one of mass 3kg moving at 2m/s, the other of mass 5kg and speed of 2m/s move towards each other and collide in a head on collision. If the collision is perfectly inelastic, find the speed of the objects after the collision.

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  1. call + x direction the initial direction of the first (3 kg) mass

    initial momentum = 3*2 -5*2 =6-10 = -4

    final momentum also -4, mass = 8

    8 * v = -4
    v = -1/2

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  2. Since its perfectly inelastic the final velocity is negated since KE in the collision is maximum

    M1V1-M2V2=(M1+M2)-Vc :Vc as final velocity

    Substitute value
    (3*2)-(5*2)=(5+3)(-Vc)
    -4=-8Vc
    Vc=0.5m/s

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