Velma passes Mort at a speed of 0.75c. At this speed, the "time dilation factor" is 1.5. In other words, Mort observes a 1- second tick of Velma's clock to take 1.5 seconds. Suppose that they are born at the same time, and that Velma observes herself to live 30 years. According to Mort's observations, how old is he when Velma dies?
A) 30 years
B) 45 years
C) 20 years
D) 10 years
E) 40 years

Question

Quizplus · Accepted Answer

Mort observes Velma's time to be dilated by a factor of 1.5, so if Velma lives 30 years according to her own clock, Mort will observe her to live 30 * 1.5 = 45 years.

Velma Passes Mort at a Speed of 0