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Find the magnitude of the horizantal force

  1. Sep 21, 2004 #1
    Hey can someone please help me with this problem. accorning to the back of the book the answer is 28N. I tried doing this first multipling 1.41*7.5 = 10.575. Then i used this formula 10.575cos(13)= but i got 9.59625.
    Am I missing a step, please help?

    a shopper pushes a 7.5-kg shopping cart up a 13 incline. Find the magnitude of the horizantal force, F, needed to give the cart an acceleration of 1.41 m/s2.
  2. jcsd
  3. Sep 21, 2004 #2
    someone please help?
  4. Sep 21, 2004 #3


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    You need to account for the fact that gravity is tending to accelerate the shopping cart downhill. :-)
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