A bullet of mass \( 100 \mathrm{~g} \) is fired from a gun of mass
\( 20 \mathrm{~kg} \) with a velocity of \( 100 \mathrm{~ms}^{-1} \). Identify the velocity of recoil of the gun
a. \( -0.5 \mathrm{~ms}^{-1} \)
b. \( 0.1 \mathrm{~ms}^{-1} \)
c. \( -0.15 \mathrm{~ms}^{-1} \)
d. \( -0.2 \mathrm{~ms}^{-1} \)
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