A train starts from station 'A'.It has to stop at station 'B' 1.4km apart.The maximum possible speed and maximum possible rate of change of speed of train are `40m/s` and `2m/s^(2)"`respectively.The minimum time taken by it to reach station B is `10T` sec.Given that maximum possible retardation is`0.8m/s^(2)`. Find T.

Options

A. 6
B. 7
C. 8
D. 5

Answer

B