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 ........... $u$
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 ........... $u$
- A
$2$
- B
$\frac{3}{2}$
- C
$\sqrt{5}$
- D
$\sqrt{10}$
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