Posted by **Ankur** on Sunday, March 7, 2010 at 9:18pm.

an object travels in a straight line at a constant acceleration for 6 seconds.in the first 2 seconds it travels 18 metres and in entire 6 seconds it covers 102 metres. find the acceleration.

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**bobpursley**, Sunday, March 7, 2010 at 9:22pm
102=vi(6)+1/2 a 36

18=vi(2)+ 1/2 a 4

multiply the second equation by 3, then subtract the second equation from the first.

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**Damon**, Sunday, March 7, 2010 at 9:24pm
d = Vi t + (1/2) a t^2

18 = Vi (2) + (1/2) a (4)

102 = Vi (6) + (1/2) a (36)

18 = 2 Vi + 2 a

or

9 = Vi + a

102 = 6 Vi + 18 a

or

17 = Vi + 3 a

8 = 2 a

a = 4 m/s^2

and

Vi = 5 m/s

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**Ankur**, Sunday, March 7, 2010 at 9:44pm
thnx guyz !!!!!!!!

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