Concept explainers
For a freely falling object dropped from rest, what is the instantaneous speed at the end of the fifth second of fall? The sixth second?
Speed of the object at the end of fifth and sixth second.
Answer to Problem 11A
Speed at the end of fifth second is 49 m/s and at the end sixth second is 58.8 m/s
Explanation of Solution
Given :
Time is given,
Formula used :
According to first equation of motion.
Where, v is final velocity, u is initial velocity and t is time
Calculation :
As the object is free falling therefore initial speed of object is,
Acceleration due to gravity,
Now, substituting the value of u ,
Now, at
Conclusion :
Therefore, instantaneous speed of the object at the end of fifth second is 49 m/s and speed at the end of sixth second is 58.8 m/s.
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Conceptual Physics: The High School Physics Program
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