Question

An 80kg person fires a 7kg rifle which expels a 0.025kg bullet at speed of 250m/s. What is the magnitude of recoil velocity.​

Answer 1

Answer:by law of conservation in momentum

Intialy person and bullet is at rest

Finally bullet and person will have velocity

The velocity of the person is recoil velocity

Total mass of person is 80+7= 87kg

87(0)+0.025(0) = 87(v)+0.025(250)

V= - 6.25/87 = -0.0718 m/s

Negative indicates that it is opposite to the velocity of bullet

Explanation:this may help yoi

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