Question 623709
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Hi
The distance s that an object falls due to gravity varies jointly as the
 acceleration g due to gravity and the square of the time t of fall
 s = gt^2
rock falls for 2 seconds on earth
 s = 4g
gravity on the moon is 0.172 that on earth
how many seconds would be required for the rock to fall an equal distance on the moon? 
 4g = .172gt^2
 4/.172 = t^2
  4.8sec = t  (rounded to one decimal point)