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As mph is in English and m/s is SI, you need to use a conversion factor which will allow you get to SI. Be sure to use an exact conversion factor.

A very easy one to use in this problem is: 1 inch = 2.54 cm

Example: Convert 55mph to m/s

Break this problem up into two steps:

1) Converting length:

1 mile = 5280 feet
1 foot = 12 inches
1 inch = 2.54 cm
100 cm = 1 meter

(55miles)(5280ft)(12in)(2.54cm) = 8851392cm/100cm = 88513.92m

2) Converting time:

1 hour = 60 minutes
1 minute = 60 seconds

(60minutes)(60seconds) = 3600 seconds

88513.92meters/3600seconds = 24.5872m/s = 25m/s

You can use this same concept to convert any measurements. Just plug in the numbers you are working with and you will have the same results.

This same method can be used for converting all measurements as long as the quantity is defined and you know what will convert.

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14y ago
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Q: How do you convert mph to meters per seconds?
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