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Concept explainers
(a)
The average deceleration of person when she is jumping into firefighter’s safety net.
(a)
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Answer to Problem 57GP
Solution:
Explanation of Solution
Given:
Initial velocity
Height
Acceleration
Formula Used:
Third equation of motion:
Where, v is the final velocity, u is the initial velocity, a is the acceleration and s is the displacement.
Calculations:
Here,
The average deceleration of person after making contact with the safety net.
Before making contact with safety net, person velocity is
Final velocity in last section will be considered as initial velocity of person in this section
Initial velocity
Final velocity
Distance
Conclusion:
The average deceleration experienced by her is
(b)
Whether the net should be tightened or loosened for smaller deceleration.
(b)
![Check Mark](/static/check-mark.png)
Answer to Problem 57GP
Solution:The net should be loosened.
Explanation of Solution
From the third equation of motion:
If net is tightened, the value of displacement (s) will decrease which will increase the value of deceleration. Thus, it is saferto loosenthe net so thatthe person has greater displacement, decelerates slowly and hence can be brought to rest more safely.
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Physics: Principles with Applications
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