As measured in Earth's rest frame, a spaceship traveling at 0.964 c takes 11.7 y to travel between planets. How long does the trip appear to take for someone on the spaceship?
options=
| 3.11 y |
| 32.1 y |
| 7.61 y |
| 44 y |
The time dilation equation :

We have,
V = 0.964C
t = 11.7 y
∴ t' = 11.7 × √1-(0.964C/C)2
= 11.7 × 0.2659
= 3.11 y
Hence 3.11 y is the correct answer.
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