A block of mass $1\,kg$ is suspended by a string of mass $1\,kg$, length $1\,m$ as shown in figure. $(g=10\,m /$ $s ^2$ ) Calculate: The tension in string at its lowest point.The tension in string at its mid-point
- A$15\,N$
- B$10\,N$
- C$20\,N$
- D$25\,N$
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- [AIIMS 2009]