Frank and Mary are twins. Mary jumps on a spaceship and goes to Alpha-Centauri (4 lightyears away) and returns. She travels at a speed of 0.8c with respect to the Earth and emits a radio signal every week. a) How much time does the trip take according to Frank?

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so do we solve it following way 1) distance/speed = time : 1 lightyear = 9.44x1015m (9.44*10^15)*4 / .8 so from this point, do we use time dilation ?

Assuming thats .8 c, then sure.

lol ,"sure"

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