Question

# If a person lives on the average 100 years in his rest frame, how long does he live in the earth frame if he spends all his life on a spaceship going at 60% of the speed of light.

Solution

## Given: Proper time, t = 100 years Speed of spaceship, v = $\frac{60}{100}c$ = 0.60c Thus, the person lives for 125 years in the Earth frame.   PhysicsHC Verma - IIStandard XII

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