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Two items to get sqrt of 2 (Posted on 2016-07-19) Difficulty: 2 of 5
Evaluate an approximate value of sqrt(2), using a sneaker and a stopwatch only.

Source: Mark Levi's "Why Cats Land On Their Feet?"

See The Solution Submitted by Ady TZIDON    
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Solution another way | Comment 2 of 5 |
On a flat field mark a spot on the ground. Then walk at a normal, sustainable and consistent rate in a straight line for 100 seconds. Make a right-angle turn (make sure the sneaker is in view either directly left or directly right). Restart timing and start walking at the same time, walking at the same consistent rate as before, and again for 100 seconds.

When you've finished that phase, time a walk at that same rate toward the sneaker. The number of seconds divided by 100 will be the square root of 2.

  Posted by Charlie on 2016-07-19 10:42:59
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