Goslo and Speedo are twins. They have just celebrated their 20th birthday (Yay!). Speedo travels to the planet Zorth which is 40 light years away, he immediately returns. Neglect any time Speedo spent accelerating. If Speedo travels at 0.997 relative to the Earth, who will measure the proper time? a. Goslo
b. Speedo
c. Nobody
d. Everybody

a. Goslo

Explanation:

given data

Speedo travels = 40 light year

Speedo travels relative to the Earth = 0.997

solution

Goslo will measure here proper time and this time is expres as

time T =  Speedo travels ÷ Speedo travels relative to the Earth   ..........................1

put here value

time T =

time T = 40.1 year

so Goslo will measure the proper time