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Need a quick check.

  1. Oct 5, 2005 #1
    These are the questions I've been working on and my physics teacher is away and I just need to have someone look these over before I continue on with the position-time, velocity-time, and acceleration-time graphs that I need to make. (His suggestion) Just to make sure that the information I have currently is accurate, or at the very least leaning in the right direction so I can correct them.
    *Please excuse the poor quality of the scans*


  2. jcsd
  3. Oct 5, 2005 #2

    Doc Al

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    (a) You go from [itex]v = \Delta d / \Delta t[/itex] (correct!) to [itex]\Delta t = v \Delta d[/itex] (incorrect!)
    (b) OK
    (c) The average speed is [itex]\Delta d / \Delta t[/itex]; what's the average speed?
    (d) Use [itex]\Delta d = v \Delta t[/itex]--you made an error similar to what you did in part a. (And don't confuse speed [itex]v[/itex] with change of speed [itex]\Delta v[/itex].)
  4. Oct 5, 2005 #3
    You need to use equations for uniform acceleration ([itex]v_2^2 = v_1^2 + 2ad[/itex] or [itex]d = v_1t + \frac{1}{2}at^2[/itex]) for (c) and time should be 5s for (d) since it's only asking the distance past the hill.
    Last edited: Oct 5, 2005
  5. Oct 10, 2005 #4
  6. Oct 10, 2005 #5


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