College Physics 10th Edition by Raymond Serway,Chris Vuille

تمرين 60

Imagine an astronaut on a trip to Sirius, which lies 8 light-years from Earth. Upon arrival at Sirius, the astronaut finds that the trip lasted 6 years. If the trip was made at a constant speed of 0.8 c , how can the 8-light-year distance be reconciled with the 6-year duration