Concept explainers
The two skaters of Exercise 56 are moving in opposite directions when they collide and stick together. Answer the same questions for this case.
(a)

The final speed of the system.
Answer to Problem 57E
The final speed of the system is
Explanation of Solution
Given info: Mass of the first skater is
Write the expression from conservation of momentum.
Here,
Substitute
Conclusion:
Therefore, the final speed of the system is
(b)

The amount of kinetic energy lost.
Answer to Problem 57E
The amount of kinetic energy lost is
Explanation of Solution
Given info: Mass of the first skater is
Write the expression for kinetic energy lost.
Here,
Substitute
Conclusion:
The amount of kinetic energy lost is
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Chapter 3 Solutions
Physical Universe
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