- Initial velocity of the rock: \( v_{ri} = 13 \, \text{m/s} \)
- Final velocity of the rock: \( v_{rf} = 11 \, \text{m/s} \)
- Mass of the rock: \( m_r = 0.150 \, \text{kg} \)
Initial x-momentum of the rock:
\[ p_{rix} = m_r \cdot v_{ri} \cdot \cos(15^\circ)
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