A few days ago
Physics need to make sure I got did this right?
To pass a physical fitness test, Marcella must run 1000 m at an average speed of 4.00 m/s. She runs the first 475 m at an average of 3.94 m/s. What should be her average speed over the last 525 m in order to finish with an overall average speed of 4.00 m/s?
_____ m/s
I can only submit this once so I have to make sure I did it right so asking you guys to reassure.
Thanks a bunch
Top 3 Answers
A few days ago
Favorite Answer
4*1000=4000
3.94*475=1871.5
—————————–
525*__=2128.5
—————————–
2128.5/525=4.0542857
+/-4.05m/s
0
A few days ago
Note, there are many different ways this can be done, but they should all give the same answer, here is the method I would use:
1000m / 4.0 m/s = 250 seconds that she has to run the distance
475m / 3.94m/s = 120.558 seconds that she used up running the first section
250-120.558= 129.442 seconds she has left, during which she must cover the remaining 525m
525m/129.442s = 4.056 m/s (average speed she must run for the remainder of the race)
0
A few days ago
4.06m/s i think
0
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