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Posted by on Friday, January 27, 2012 at 6:11pm.

A 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. Find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earth’s velocity. Earth’s mass is 6.0 × 1024 kg. Show all your work, assuming the rock-earth system is closed.

  • Physics - , Friday, January 27, 2012 at 6:15pm

    v = sqrt (2 g h) = sqrt (2*9.8*5)
    = 9.9 m/s

    total momentum before = 0
    total momentum after
    = 14*9.9 - 6*10^24 v = 0

    v = (14 * 9.9/6)*10^-24

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