Answer:
rolling ball down a hill
Explanation:
A rolling ball has kinetic energy
Answer:
Aluminum
Explanation:
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The average speed is 20.8 m/s
Explanation:
The average speed for the trip is given by:
![v=\frac{d}{t}](https://tex.z-dn.net/?f=v%3D%5Cfrac%7Bd%7D%7Bt%7D)
where
d is the distance covered
t is the time elapsed
For the trip in this problem, we have:
d = 187 km = 187,000 m is the distance travelled
The initial time is 10:00 pm while the arriving time is 12:30 am: this means that the time elapsed is 2.5 hours. Converting into seconds,
![t = 2.5 h \cdot (60)(60)=9000 s](https://tex.z-dn.net/?f=t%20%3D%202.5%20h%20%5Ccdot%20%2860%29%2860%29%3D9000%20s)
Therefore, the average speed for the trip is
![v=\frac{187,000}{9000}=20.8 m/s](https://tex.z-dn.net/?f=v%3D%5Cfrac%7B187%2C000%7D%7B9000%7D%3D20.8%20m%2Fs)
Learn more about average speed:
brainly.com/question/8893949
brainly.com/question/5063905
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Answer:
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