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Work-kinetic energy theorem

  1. Oct 30, 2006 #1
    The CN tower in 553m tall. Suppose a chuck of ice w/ a mass of 25.0g falls from the top of the tower. The speed of the ice is 33.0m/s as it passes the restaurant in the tower located 353m above the ground. What is the average force due to air resistance?

    I'm having trouble getting started on this problem. I know how to calculate work and change in KE, but how do I use those to get the answer? Any help would be appreciated.
  2. jcsd
  3. Oct 30, 2006 #2
    You could start by figuring out what the ice's velocity would be without any air resistance.
  4. Oct 30, 2006 #3
    ok now what
  5. Oct 30, 2006 #4
    He's implying to look at the loss in kinetic energy...

    Now, how would you calculate the work done by air resistance?
  6. Oct 30, 2006 #5
    find diff. b/w KE w/out air resistance and with air resistance?
    Last edited: Oct 30, 2006
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