JEE Main Physics Mechanics #26 (QUICK!) One Dimensional Motion

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WE WILL SOLVE THE SAME PROBLEM AS PREVIOUS USING A “QUICK!” METHOD.
An engine of a train, moving with uniform acceleration, passes the signal post with velocity u and the last compartment with velocity v. The velocity with which the middle point of the train passes the signal post=?
A) SQRT[(v^2-u^2)/2]
B) (v-u)/2
C) SQRT[(v^2+u^2)/2]
D) (v+u)/2

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[waqassaeed]

Sir waiting eagrly for your textbook/guidance book on such tests, with different tips techniques and solution all together.