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A 20 kg block with a speed of 10m/s collides with a 4kg block that has a speed of 5m/s in the same direction. After the collision, the 4 kg block travels in the original direction with a
speed of 7 m/s  (a) What is the velocity of the 20 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 4kg  block ends up with a speed of 8 m/s What then is the change in the total kinetic energy?

4. A 20 kg block with a speed of 10 m/s collides with a 4 kg block that has a speed of 5 m/s in the same direction. After the collision, the 4 kg block travels in the original direction with a speed of 7 m/s. (a) What is the velocity of the 20 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 4 kg block ends up with a speed of 8 m/s. What then is the change in the total kinetic energy?
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Transcribed Image Text:4. A 20 kg block with a speed of 10 m/s collides with a 4 kg block that has a speed of 5 m/s in the same direction. After the collision, the 4 kg block travels in the original direction with a speed of 7 m/s. (a) What is the velocity of the 20 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 4 kg block ends up with a speed of 8 m/s. What then is the change in the total kinetic energy?
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