A problem by Carlo Fornoles

Level pending

Kenneth loves to read books and read about time dilation. He found out that the faster you move, the slower your time. He decided to run for one hour every morning at a constant speed of 3km per hour. If he continued doing that for 50 years, how much younger will he get? The equation is t' = t/(1-(v/c)^2)^(1/2). Answer should be in seconds, assume that 1 year=365 days and c = 3*10^8 m/ sec.

2.13E-2 2E-4 2.1E-3 0.213

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