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2015-09-15T00:11:20+05:30

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U = a t  = instantaneous speed
 a = acceleration.
This means that  initial speed at t = 0 is 0.
speed is proportional to time.

so  s = 0 * t + 1/2 a t² = 1/2 * a * 4²
           = 8 a  units

1 5 1
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