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A 3.2 kg block with a speed of 11 m/s collides with a 11 kg block that has a speed of 3.3 m/s in the same direction. After the collision, the 3.2 kg block is observed to be traveling in the original direction with a speed of 6.4 m/s. (a) What is the velocity of the 11 kg block immediately after the collision? (b) By how much does the total kinetic energy of the system of two blocks change because of the collision? (c) Suppose, instead, that the 3.2 kg block ends up with a speed of 4.7 m/s. What then is the change in the total kinetic energy?

I got that a. is 4.64Ns, but I'm not sure how to go about the other two parts.

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