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Help Please: Gravitational Force Problem

  1. Sep 22, 2004 #1
    A rock of mass 33 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 239 N. What is the magnitude of the acceleration of the rock?

    ? m/s2
     
  2. jcsd
  3. Sep 22, 2004 #2
    This is really basic. Use F = ma:

    F = ma

    mg - 239 = ma

    Now put in the values for m and g and solve for a.
     
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