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HELP! Simple Work Problem!

  1. Mar 19, 2009 #1
    Sam works at an amusement park. A boat of children on a water ride comes the the pier at the end of the ride. They are moving at a constant speed of 1.2 m/s, and the loaded boat has a mass of 1200kg. Sam slows the boat down by pushing on it until it comes to rest at the pier. If he stops it in a distance of 1.75m, and his arms make a 30o angle above the horizontal,

    * a) how much work did Sam do on the boat?
    * b) how large a force did he apply to the boat?

    I thought if I added the mass X gravity that would five me force.
    Then I took F cos theta X s to get 1.51 J
    and the foce would be 11760.

    I am not sure if that is right.

    Please any help would be great!!
  2. jcsd
  3. Mar 19, 2009 #2
    First find out the acceleration of the boat using kinematic data given...and calculate the force applied by Sam.
  4. Mar 19, 2009 #3
    I don't understand how you would solve for acceleration.
  5. Mar 19, 2009 #4


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    Hi Rha1828! :smile:

    Just use one of the standard constant acceleration equations. :wink:
  6. Mar 19, 2009 #5


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