1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook