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iris [78.8K]
2 years ago
12

Brad walks and jogs to schooll every day. He averages 5 km/hr walking and 9 km/hr jogging. The distane from home to shool is 6 k

m, and the total trip takes 1 hour. How far does Brad walk?
Physics
1 answer:
Vitek1552 [10]2 years ago
5 0
We know that
Distance = speed x time
Let w be the time Brad spent walking. The time spent jogging will be 1 - w
6 = 5w + 9(1 - w)
w = 0.75 hours
Distance walked = 0.75 x 5
= 3.75 km
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The average speed is the ratio between the total space and the total time of the motion:
v= \frac{S_{tot}}{t_{tot}}
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while the total time is 
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So, the average velocity is
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We can also rewrite it in m/s. The total space is S_{tot}=119000 m, while the time is t_{tot}=5h\cdot 3600 s/h = 18000s, and so
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Answer:

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Explanation:

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