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Im a real dummy to physics! Help with questions please!

  1. Sep 14, 2005 #1
    A car starts from rest and accelerates to a speed of 72 km/h in 5 seconds. Assuming uniform acceleration, what is the acceleration in meters per second squared?

    A ball is thrown straight up witha speed of 36 m/s. How long does it take to return to its starting point?

    Barbara travels 20 km Northward, then travels 40 km Eastward, then continues for 50 km in a Southward direction. What displacement will now take her back to her initial position?
     
  2. jcsd
  3. Sep 14, 2005 #2
    Do you know any basic kinematic equations?
     
  4. Sep 15, 2005 #3
    No, not without the book. I'm not good in physics at all....
     
  5. Sep 15, 2005 #4

    Tom Mattson

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    Gold Member

    OK, so use the book until you've learned them.

    We have a policy here, which is posted at the top of the Homework section of PF. It states that you have to make an attempt at your problems and show your work in order to receive help.

    So let's have it! :biggrin:
     
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