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28 June, 21:03

a stationary bomb of mass 5kg exploded into one part A of mass 2kg flying off with a velocity of 60 m/s and another part B of mass 3kg flying off with a velocity v in the opposite direction. find v and the total Kinetic energy

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  1. 28 June, 22:03
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    Momentum before = momentum after

    (5 kg) (0 m/s) = (2 kg) (60 m/s) + (3 kg) v

    v = - 40 m/s

    Total kinetic energy is:

    KE = ½ (2 kg) (60 m/s) ² + ½ (3 kg) (-40 m/s) ²

    KE = 6000 J
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