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If you fire a bullet at a speed vi,bullet = 400 m/s into a wooden block...

If you fire a bullet at a speed vi,bullet = 400 m/s into a wooden block of mass 0.2 kg, and after the bullet embeds in the wood, the velocity of the bullet and block together is 7.8 m/s. What is the mass of the bullet?

4 g
6 g
2 g
0.2 kg

What is conservation of momentum a special instance of?

Newton's 2nd law, the momentum principle
Newton's 1st law, the inertia principle
Newton's 3rd law, the reciprocity principle
Conservation of energy
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