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

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The two ends of a train moving with constant acceleration pass a certain point with velocities u and 3u- The velocity with which the middle point of the train passes the same point is

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The two ends of a train moving with constant acceleration pass a certain point with velocities u and 3u. The velocity with which the middle point of the train passes the same point is

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