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Homework Help: Asteroid and speed

  1. Jan 7, 2009 #1
    1. The problem statement, all variables and given/known data
    A 4.50 x 10^4 kg asteroid has 6.20 x 10^12 J of kinetic energy. What is the speed of that asteroid?

    2. Relevant equations

    3. The attempt at a solution
    V=(6.2 x 10^12)/((4.50 x 10^4 kg)(9.8)
    V=1.41 x 10^7 m/s

    I am wondering about the gravity part though. Normally, for weight it is on earth, so 9.8 works. But if the asteroid is in space, then can I still use 9.8?
  2. jcsd
  3. Jan 8, 2009 #2
    KineticEnergy = 0.5 * mass * velocity * velocity

    no gravity involved
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