The Relativity of Time: Time Dilation?

Question

A particle lives for a short time before breaking apart into other particles. Suppose it is moving at a speed of 0.988c, and an observer who is stationary in a laboratory measures the particle's lifetime to be 2.50 10-8 s.
(a) What is the lifetime according to a hypothetical person who is riding along with the particle?
s

(b) According to this hypothetical person, how far does the laboratory move before the particle breaks apart?
m

Answer 1

a) t= (2.50x10^-8)(sqrt(1-(0.988c^2)/(c^2))... Press calculator...

b) s=0.988c X (t from part a)... Press calculator...