Becky is trying to throw a \(1\text{ kg}\) rock as far as possible. She threw the rock 4 times, at an angle of \( 20 ^ \circ, 40 ^ \circ, 60 ^ \circ\) and \( 80 ^ \circ \) with respect to the horizontal. Which of those resulted in the rock traveling the furtherest horizontally?

**Details and Assumptions**

- The rock completely stops motion on its first contact with the ground.
- Ignore any air resistance.

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