A 21g particle is moving to the left at 29 ms. how much, Ask an Expert

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Q. A 5.70 g bullet moving at 551 m/s strikes a 730 g wooden block at rest on a frictionless surface. The bullet emerges, traveling in the same direction with its speed reduced to 499 m/s. (a) What is the resulting speed of the block? (b) What is the speed of the bullet-block center of mass?

Q. A 21 g particle is moving to the left at 29 m/s. How much work must be done on the particle to cause it to move to the right at 41 m/s?

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