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Posted by on Friday, July 22, 2011 at 9:00pm.

A stone is dropped from the edge of a roof, and hits the ground with a velocity of -145 feet per second. How high (in feet) is the roof

  • Calculus - , Friday, July 22, 2011 at 9:03pm

    Ke = (1/2) m v^2 = (1/2) m (145^2)
    pe = m g h where g = 32.2 in ft/seconds units
    32.2 m h = (1/2) m (145^2)
    h = 326 feet

  • Calculus - , Friday, July 22, 2011 at 9:03pm

    vf^2=2gh

    solve for h, in feet

    g= 32ft/s^2

  • Calculus - , Monday, March 12, 2012 at 1:52am

    Hey Bob, I was wondering why gravity is 32m/s^2 instead of 9.8m/s^2. Can you explain why this is?

  • Calculus - , Thursday, June 7, 2012 at 3:23am

    Check the units m/s^2 and ft/s^2

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