Physics

An object of mass 9.0 kg is moving due west with a uniform speed of 4.0 m/s. It suddenly explodes into two parts having masses of 6.0 kg and 3.0 kg. Just after the explosion, the 3.0 kg mass has a velocity of 15 m/s due west relative to the Earth's surface. What is the speed of the 6.0 kg mass relative to the Earth's surface?

*If possible, please show the process in how you got the answer!*

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  1. the momentum after = the momentum before
    momentum before = 9 * 4 West + 0 North
    momentum after = 3 *15 West + 6 * v West + 0 North
    so
    36 = 45 + 6 v West
    6 v West = - 9
    v West = -9/6 = -1.5 West or in other words 1.5 East

  2. Thank you so much for your help!

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  3. You are welcome.

  4. Given: M1 = 9kg, V1 = -4m/s, M2 = 6kg, V2 = ?, M3 = 3kg, V3 = -15m/s.
    Momentum before = Momentum after
    M1*V1 = M2*V2 + M3*V3
    9*(-4) = 6*V2 + 3*(-15)
    -36 = 6V2-45
    V2 = 1.5 m/s, East.

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