how much energy is stored in a 7.0 cm spring that has a spring constant of 500 N/m when it is stretched 3.0 cm
1 answer:
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Answer:
<em>a) The speed of Juan is 250 m/min </em>
<em>b) In that interval, he's at rest </em>
<em>c) Juan would have needed 12 minutes to run 3000 m</em>
Explanation:
<u>Distance vs Time Graph Analysis </u>
If time is on the horizontal axis, and the distance is in the vertical axis, then the slope of the graph represents the instantaneous speed of the moving object. The graph shows three different zones which reflect Juan's jogging at that morning.
a) The period between 4 and 6 minutes clearly shows Juan is moving in such a way the distance increases when time passes. The speed of the motion can be obtained by computing the slope of the line. We can locate the points (4,1000) and (6,1500). We compute the speed
The speed of Juan is 250 m/min
b) We can see between 7 and 11 minutes, Juan's distance is not changing because he stopped running. In that interval, he's at rest
c) We have already determined the speed on the first 7 minutes (the same as between 4 and 6 minutes). We know that
Where v is the speed, x is the distance, and t is the time
We need to know the time needed to travel x=3000 m at the initial speed v=250 m/min, so we solve the equation for t
Juan would have needed 12 minutes to run 3000 m