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A rock rolling down an incline-velocity and force

  1. Sep 21, 2009 #1
    The question is:
    a spherical rock weighing 20 tons starts rolling down a steep incline from a height of 400 metres. Calculate the velocity when it reaches the ground level. What is the force exerted on the rock?

    I've tried to work this out but I just can't seem to grasp exactly what I'm missing.

    Any help will be really appreciated.
  2. jcsd
  3. Sep 21, 2009 #2
    Conservation of energy ::biggrin::
  4. Sep 21, 2009 #3
    hmm...could you explain it a bit further.
  5. Sep 21, 2009 #4
    Use conservation of energy. The energy the rock has at the start and what is the energy converted to when it reaches the bottom
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