65. A 0.20-kg softball is traveling at a velocity of 20 m/s to the east relative to Earth. It collides head-on with a 0.40-kg rubber ball traveling at a velocity of 10 m/s to the west. (a) If

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(a) If the system's kinetic energy, as measured from the Earth reference frame, decreases by 20% because of the collision, what are the final velocities of the balls?

(b) What change in internal energy has occurred?

(c) An observer watches this collision from a reference frame moving at a velocity of 15 m/ s to the east relative to the Earth reference frame. What changes in kinetic energy does this observer measure?

65. A 0.20-kg softball is traveling at a velocity of 20 m/s to the
east relative to Earth. It collides head-on with a 0.40-kg
rubber ball traveling at a velocity of 10 m/s to the west. (a) If
Transcribed Image Text:65. A 0.20-kg softball is traveling at a velocity of 20 m/s to the east relative to Earth. It collides head-on with a 0.40-kg rubber ball traveling at a velocity of 10 m/s to the west. (a) If
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