physics

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can someone explain how to do this step by step i already have the answer but i need to know how to do it!!

the answer is (a)6.67m/s (b)111km/s^2

The muzzle velocity of 50g shell leaving a 3kg rifle 400m/s(a)What is the recoil velocity of the rifle?(b)If the bullet travel 72cm before leaving the end of the barrel, at what rate what the bullet accelerated?

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