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The length of a ballistic pendulum is 1 ...

The length of a ballistic pendulum is `1 m` and mass of its block is `1.9 kg`. A bullet of mass `0.1 kg` strikes the block in horizontal direction with a velocity `100 ms^(-1)` and got embedded in the block. After collision the combined mass swings away from lowest point. The tension in the strings when it makes an angle `60^@` with vertical is `(g=10 ms^(-2))`.

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