A \( 100 \text{m}\) long erupting volcano ejects a rock with speed \( 10\sqrt{10} \text{ms}^{-1}\) at a such angle from horizon that rock gets it's maximum range. Find this unknown angle(in degree).

**Details**

- \( g = 10 \text{ ms}^{-2}\)
- There is no air resistance and no change in gravitational acceleration.

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