The momentum of missile is [tex]\bold {20,000 kg-m/s\; east}[/tex].Momentum (p) is calculated using the formula: [tex]p = mv\\[/tex]where;m = mass (of missile)v = velocity (of missile) [tex]p = mv\\p= 200 kg \times 100 \frac{m}{s} \\p = 20,000 kg \cdot \frac{m}{s} \implies \text (ANSWER)[/tex]