$A$ body travelling with uniform acceleration crosses two points $A$ and $B$ with velocities $20 \,m/s$ and $30 \,m/s$ respectively. The speed of the body at the midpoint of $A$ and $B$ is (nearly)
- A$25 \,m/s$
- B$25.5 \,m/s$
- C$24 \,m/s$
- D$10 \sqrt{6} \,m/s$
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