Question

Two twin sisters, Gwen and Jackie, are both 20 years old in the year 2050. Jackie takes off on a round-trip to Vega, 25 light-years away. She travels at an average speed close to the speed of light, say, 0.9999c. According to Gwen back on Earth, about how long does it take Jackie to reach Vega?A. about a month

B. about 10 years
C. about 25 years
D. about 100 years

Answer 1

C. about 25 years.

Explanation:

We have been given that two Jackie takes off on a round-trip to Vega, 25 light-years away. She travels at an average speed close to the speed of light, say, 0.9999c.

To find time it will take Jakie to reach Vega, we will divide the distance of Vega by Gwen's speed.

`\text{Time}=\frac{\text{Distance}}{\text{Speed}}`

`\text{Time}=(25)/(0.9999)`

`\text{Time}=25.00250`

`\text{Time}\approx 25`

Therefore, it will take approximately 25 years for Jakie to reach Vega and option C is the correct choice.