numericals

A 100g bullet is firred from a 10 kg gun with a speed of 1000 m/s.What is the speed of recoil of the gun.

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  1. 0=m1v1+MV
    MV=-mv
    V=-mv/M
    =O.1×1000/10
    v=-10m/s

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  2. why negative sign?

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