To calculate Glider 1's starting momentum, we use the formula: momentum (p) = mass (m) × velocity (v). For Glider 1, with a mass of 2.4 kg and a velocity of 3.0 m/s, the momentum is p = 2.4 kg × 3.0 m/s = 7.2 kg·m/s. The additional masses mentioned (5.4 kg, 7.2 kg, and 10.8 kg) do not relate to Glider 1's momentum calculation.
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