Astronaut sarah leaves earth in a spaceship at a speed of 0.280c relative to earth. sarah's destination is a star-system 12.5 light-years away (one light-year is the distance light travels in one year). according to sarah, how far did she travel during the trip?

L= 12 light years

Explanation:

for length dilation we use the formula

now calculating Lo

Lo = 12.5×365×24×3600×3×10^8

= 1.183×10^17 m

now putting the values of v and Lo in the above equation we get

= 1.136×10^17 m

L=  m

so L= 12 light years

and 1and 1

friction

explanation:

they us to move forward and backwards