- The mass of the first piece (m1) is 0.28 kg and its velocity along the x-axis (vx1) is 8.6 m/s.
- The momentum (p1) of the first piece is given by the formula:
\[
p1 = m1 \cdot vx1 = 0.28 \, \text{kg} \cdot 8.6 \, \text{m/s} = 2.408 \, \text{kg m/s}
\]
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