Question

a riffle bullet of mass7gm leaves the barrel of riffle with a velocity of 300m/s. if the riffle recoils the velocity of 1m/s. find the mass of riffle?

Answer 1

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This problem can be solved by the principle of conservation of momentum.

By conservation of momentum (P),

          P1 = P2

We know that P = m.v

So, m1v1=m2v2

So substituting values,

7*300 = m2* 1

m2 = 2100 gm = 2.1 kg