Internal energy question.?
Consider a situation where two moving objects collide, stick to each other, and move off together. The internal energy of the system after the collision ________.
a remains constant
b increases
c decreases
d varies but in a way that cannot be predicted
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What is described is a "perfectly inelastic" collision. As such the maximum useful mechanical energy that can be lost is lost in this type of collision. The "lost energy" creates heat and therefore increases the system's (assuming a closed system) internal energy.
b. ANS