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Homework Help: Physics HW

  1. Jan 20, 2008 #1
    1. The problem statement, all variables and given/known data
    A skateboarder, starting from rest, rolls down a 11.9-m ramp. When she arrives at the bottom of the ramp her speed is 6.77 m/s. (a) Determine the magnitude of her acceleration, assumed to be constant. (b) If the ramp is inclined at 29.8 ° with respect to the ground, what is the component of her acceleration that is parallel to the ground?

    3. The attempt at a solution

    I dont even have a clue where to start??? How can i figure out the magnitude of acceleration without the time?? And i dnt even understand what the second part is asking at all?

    Any help on where to start is appreciated..
  2. jcsd
  3. Jan 20, 2008 #2


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    Homework Helper

    You may not have the time, but you have the distance. Take a closer look at your kinematic equations.

    Since she is accelerating down the ramp (so at an angle with the ground). You can resolve her acceleration into horizontal and vertical components.
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