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Homework Help: Projectile motion stunt doubles

  1. May 25, 2009 #1
    In the movie Thelma and Louise, the two actresses drove off a cliff at the end. In preparation for the scene, their stunt doubles determined that the cliff was 50.0 m high. The director wants the car to land 90.0 m from the base of the cliff close to the camera location. How fast must the car be travelling in order to land at this location? [101 km/h]

    I found this question on the internet, I had been doing projectile questions all night with great success, however for some reason i cant seem to get 101km/hr for this question. It doesn't make sense.

    If it is driven off the cliff, then inital vertical velocity is 0, therefore gravity will pull it down in 5.1 seconds no? So in that 5.1 seconds the car must have enough vertical velocity to go 90m, traveling at 17.6m/s for 5.1seconds will take you 90m.

    Whats the deal? Is that answer wrong?
  2. jcsd
  3. May 25, 2009 #2
    just to clear things up how did you calculate 5.1 seconds?
  4. May 25, 2009 #3


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    What did you use to obtain this time?
  5. May 25, 2009 #4
    i can obtain the correct answer, we just need to see where you got 5.1 seconds from?
  6. May 25, 2009 #5


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    Welcome to PF!

    Hi pinkfloyd12! Welcome to PF! :smile:
    Noooo :wink:
  7. May 25, 2009 #6
    Whoooops. Got it. Units to the maximum.
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