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![[Post New]](/templates/default/images/icon_minipost_new.gif) 13 Nov 2007 17:38:26 IST
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The formula S=ut+1/2 at^2 is only for constant acceleration . If the acceleration changes with time, this cannot be used.
Here the acceleration is not constant. the increase in velocity is 2m/s but (increase in velocity )/( time taken ) will give only the average acceleration.It does not mean that the acceleration was 2 m/s^2 from the time it started till the end.
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