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The two ends of a train moving with constant acceleration pass a certain point with velocities $u$ and $3 u$ . The velocity with which the middle point of the train passes the same point is
$2 u$
$\frac{3}{2} u$
$\sqrt{5} u$
$\sqrt{10} u$

A

2 u

B

\sqrt{5} u

C

\frac{3}{2} u

D

\sqrt{10} u

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