Given:
"m_{gun}=15\\:\\rm g"
"m_{bullet}=2\\:\\rm g"
"v_{bullet}=600\\:\\rm m\/s"
The law of conservation of momentum says
"m_{bullet}v_{bullet}=m_{gun}v_{gun}"Hence, the recoil speed of the gun
"v_{gun}=\\frac{m_{bullet}v_{bullet}}{m_{gun}}=\\frac{2*600}{15}=80\\:\\rm m\/s"Recommended textbooks for you
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