Recent content by devin125

  1. D

    A simple question about the concept please come and help

    O...I understand now. Thx for helping...
  2. D

    A simple question about the concept please come and help

    but what is the F in order to minus the friction?
  3. D

    A simple question about the concept please come and help

    the force is net force, so is it just F-the friction= ma?
  4. D

    A simple question about the concept please come and help

    I dun really get it, for all I understand is only F=ma...
  5. D

    A simple question about the concept please come and help

    What is the greatest acceleration a runner can muster if the friction between her shoes and the pavement is 90% of her weight?
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