Answers

2016-02-03T19:12:48+05:30
A) 185=10/2(2a+(5-1)3)
      = 5(2a+(4*3))
      = 10a+60              (4*3=12; nd 12*5=60)
185-60=10a 
125/10=a
∴a=12.5
0
a) a=5 m/s2
b) d= 60/9 m
a=5
where did m and m/s2 come from?
those are the units for distance(d)  and acceleration (a)
2016-02-03T19:18:02+05:30
As s=n/2(2a +(n-1)d put the value where s=185, n=10 and d=3 185=10/2{2a+(10-1)3} 185=5{2a+(9*3)} 185=5{2a+27} 185=10a+135 185-135=10a a=50/10 a=5 As given S=380, a=8 and n=10 380=10/2{2*8+(10-1)d} 380=5{16+9d} 380/5=16+9d 76=16+9d 76-16 = 9d 60 = 9d d = 60/9 d = 6.666
0