*Speed #2*
*Budapest, Hungary*
*2011*

Here’s a challenge for the engineer/scientist types out there. Given the exposure for this photograph was 1/20s, estimate the speed this bicyclist was traveling. My first calculation was 82mph. I think I need to go back and revisit my assumptions. In the meantime, Happy New Year!

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JCRAssuming the leading blur on the curbside object nearest the biker is about 1 foot, the biker travels —

1 foot in 1/20 second = 20 ft/sec.

20 ft x 60 seconds = 1,200 ft/minute

1,200 ft x 60 min = 72,000 ft/hour

72,000 ft / 1 Mile (5,280 ft) = 13.636 mph

But, I’m no engineer so WDIK?

Hoppy Gnu Ear !

LarryJim, I assumed the blur was 6s, and used the same calculation process as you did. So, once I corrected the error that gave me 80mph as the result, it’s not surprising I got half the speed you did.