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Physics: Muzzle velocity of a rifle. What is the speed of the bullet.

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See the attached file.

The oscillation period is 1.25 seconds (just in case it's hard to read)

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Solution Summary

The solution is detailed with adequate explanation and calculations. The speed of the bullets are found. The velocity of muzzles are given.

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Applying law of conservation of momentum,
mv+M*0 = (m+M) v2 ------------------1
where m = mass of bullet = 7.87 g
M = mass of block = 6.085 Kg
v2 = m*v/(m+M)

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