Question

A spacecraft flies away from the earth with a speed of4.90×10⁶ ${\rm m/s}$ relative to the earth andthen returns at the same speed. The spacecraft carries an atomicclock that has been carefully synchronized with an identical clockthat remains at rest on earth. The spacecraft returns to itsstarting point 365 days (1 year) later, as measured by the clockthat remained on earth.

What is the difference in the elapsed timeson the two clocks, measured in hours?

Answer 1