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 middle point of the train passes the signal post is :
${{u + v} \over 2}$
$\sqrt {{{{v^2} - {u^2}} \over 2}} $
${{v - u} \over 2}$
$\sqrt {{{{v^2} + {u^2}} \over 2}} $
Solution
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