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[Post New]2 May 2007 20:12:36 IST
    Subject: Re:one d motion
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Prakriteesh (153)

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Olaaa!! Perrrfect answer. 21  [45 rates]
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v = at1
i.e. t1 = v/a
 
0 = v - bt2
i.e. t2 = v/b
 
So, total time of travel is t1+ t2 = v(1/a +1/b)
 
Now,
 v2 = 2as1  or  s1 = v2/2a
0 = v2 - 2bs2  or s2 = v2/2b
 
 So, total distance = s1 + s2 = v2/2 . (1/a + 1/b)
 
So, avg. speed = total distance / total time
                      = v/2
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