\\\\(200 = u(2) + \\dfrac {1}{2} \ imes a (2)^2 = 2u + 2a = 200\\\\)\\\\(\\Rightarrow u + a =100 - (1)\\\\)Distance in next \\\\(4\\ sec\\\\) \\\\( \\Rightarrow s_6 - s_2\\\\)\\\\(\\Rightarrow 220 = (u (6)] + \\dfrac {1}{2} a (6)^2) - (u (2) + \\dfrac {1}{2} a (2)^2)\\\\)\\\\(420 = 6u + 18a - (2)\\\\)\\\\(420 = 6 (100 - a) + 18a (from 1)\\\\)\\\\(\\Rightarrow -180 = 12a \\Rightarrow a = - 15 m/s^2 , u = 115 m/s\\\\)\\\\(v\\ (at \\;end \\;of \\;7 \\;sec) = u + at\\\\)\\\\(= 115 + (-15 \ imes 7) = 10 m/s\\\\)