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2007-03-03 20:26:04 · 7 answers · asked by Lawrence C 1 in Science & Mathematics Mathematics

7 answers

100m in 10 sec = 10m/sec.

10m x 3600sec= 36000m/hour
36000m/hour / 1000= 36km/hour

2007-03-03 20:32:06 · answer #1 · answered by giggssoccer83 3 · 0 0

~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~~~~ ~~~
Don't use formulas if you don't have to—you won't remember them years later, and will have to go searching for them. It's easy! Don't be a slave to measurements.

♪♫ ♪♫ Let the measurements work for you! ♪♫ ♪♫

Since you want km on top and hour on the bottom in your answer, set up your equation that way...everything else will cancel out. If you notice that something is not on top or on bottom like it should be, simply pull a flipperooski.

First state your problem, 100 m over 10 sec. Next...you know meters is related to kilometers, so put km on top and m on bottom. You know that seconds are related to minutes and minutes to hours, so put seconds on top, minutes on bottom, minutes on top, and hours on the bottom because your answer requires hours to be in the denominator. (You could skip the minutes step and put in 3600 sec per hour, but you should show all your work.) Please ignore dot leaders...they're for spacing in a challenged word processor.


Problem:

Convert 100 m per 10 sec (per means divided by, not multiplied by) to km per hour.


Solution:

100 m ... ... 1 km ... ... 60 sec... ..60 min ... ... ... 36 km
--- --- --- .X. --- --- --- .X. --- --- --- X --- --- --- ..=.. --- --- --- = 36 km/hour
10 sec... .. 1000 m ... . 1 min... .. 1 hour ... ... ... 1 hour

Notice how m cancels m, sec cancels sec, min cancels min, and you are left with km in numerator and hour in denominator. I would have drawn a slash through each measurement that cancelled, but that isn't supported in this word processor.
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2007-03-03 22:17:12 · answer #2 · answered by M J 3 · 0 0

Multiplying metres and seconds gives metre-seconds, not metres/second. Metres/second can be converted to kilometres/hour, and metre-seconds to kilometre-hours, but the conversion factors are different.

100m x 10sec = 0.1km x 10/3600 hr = 1/3600 km-hr.
100m / 10sec = (1/10)km/(1/360)hr = 36 km/hr.

2007-03-03 22:39:02 · answer #3 · answered by Anonymous · 0 0

100m in 10 sec is speed of 10m / sec
1 hour = 3600 sec

1sec<-----------> 10m
3600sec<------>3600 x 10 / 1000 km = 36 km

Speed = 36 km / hour

2007-03-03 21:11:18 · answer #4 · answered by Como 7 · 0 0

100m x10 sec means 0.1 km/sec
3600 seconds in one hour so it is
0.1 x 3600 km/hour
or
360km/hour

2007-03-03 22:41:43 · answer #5 · answered by reza 2 · 0 0

clear your question and post it again.

1km = 1000m
1m = 0.001km
100m = 0.01km

1hr = 60mins
1min = 60sec
1hr = 3600 seconds
10sec = 0.002778hr

2007-03-03 20:35:12 · answer #6 · answered by exo 7 · 0 0

36m/s = 10km/hr

2007-03-03 22:27:19 · answer #7 · answered by yash_slim_shady 2 · 0 0

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