Physics Help Forum Displacement

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Jun 8th 2009, 12:27 AM #1 Junior Member   Join Date: Jun 2009 Posts: 1 Displacement Displacement of a free fall object from rest after 1s, 2s, and 3s is s1, s2, and s3 respectively. What is the ratio of s1:s2:s3 ? Please help, thanks!
 Jun 8th 2009, 03:16 AM #2 Physics Team   Join Date: Feb 2009 Posts: 1,425 Please attempt to answer in future and let us know where exactly you face a problem. Use the equation s = ut + 0.5 g t^2 where u is the initial velocity = 0 since it starts from rest, t is the time , and g = 9.8m/sec^2 the accln due to gravity. Plug in the values t1 = 1, t2 = 2 and t3 = 3 in the above equation and find the ratio. Note that the ratio is independent of g! This means that this ratio will be the same on the moon also where g is different!

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