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2014-08-15T14:45:47+05:30

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For the first 2 seconds

S =  U t + 1/2 a t² 

d1 = 0 * 2 + 1/2 a 2²
d1 = 2 a

d2 = 0* 4 + 1/2 a 4²  = 8 a

d3 = 1/2 a 6²  = 18 a

d1 : d2 : d3  =  1 : 4 : 9  =  1² : 2² : 3²


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2014-08-15T17:20:38+05:30
S=ut+1/2at²
d1=0+1/2*a*2²
   =2a
d1+d2= 1/2*a*4²
         =8a
d2=6a

d1+d2+d3= 1/2 *a * 6²
               =18a
d3=10a

answer: d1,d2,d3 are 2a, 6a and 10a respectively.
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