To convert from miles per hour to miles per second, use this formula:
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55 miles per hour
"Per second per second" is a measurement of acceleration. If an object (such as a car) is moving, its speed can be measured in terms of miles per hour, or feet per second (which work out to be a similar figure to miles per hour). If the car is accelerating, the acceleration can be measured in terms of additional speed (feet per second) that is acquired in a given second, therefore, feet per second per second. Get it?
No, the speed of light is 186,282.4 miles per second. The speed of sound at sea level is about 0.2114 miles per second.
The speed of sound at sea level is about 0.211 miles per second.
The speed of light is 186,000 miles per second in a vacuum.