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.
60 mph = 26.82 meters per second.
Multiply mph by 0.45 to get meters per second. So, 55 x 0.45 = about 24.6 meters per second.
Well, there are 1609.344 meter in one mile, and there are 3600 seconds in one hour, so 1mph times 1609.344 meters per mile equals 1609.344 meters per hour and 1609.344 meters per hour times 1 hour per 3600 seconds equals .44704 meters per second. In other words take your mph, multiply by .44704, and that's how many meters per second it equals.
At 45 miles per hour, a distance of 500 meters requires about 24.8 seconds.
1 mile = 1609 meters 1 hour = 3600 seconds, so 1 mile in 1 hour = 1609 meters in 3600 seconds
Use this formula: mph x 0.447 = meters per second
100 meters per 15.00 seconds = 14.91 mph
120 meters in 5 seconds works out to 24 meters per second or 53.7 mph
60 mph = 26.82 meters per second.
105 mph = 46.9392 meters per second. (Multiply mph by .045 to get meters per second)
2000 (meters per second) = 4,473.87258 mph
Multiply by seconds.
1 mph = 0.44704 meters per second.
250 mph = 111.76 meters per second
66.6 mph = 29.77 meters per second.
k seconds per mile = 3600/k miles per hour.
1 mile is 1609.344 meters. 1 hour is 3600 seconds. 60 miles is (60 * 1609.344 =) 96561 meters. Therefore 60 miles per hour is 96561 meters per 3600 seconds. After simplyfying (dividing both by 3600): 60 mph = 26.82 m/s