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**Find the speed of a particle that takes 2.0 y longer than light to travel a distance of 6.7 ly. Answer is wanted in terms of 'c'.**

**delta(t)= delta(t0)/(sqrt(1-(v/c)^2)).**

**8.7= 1/(sqrt(1-(v/c)^2))-->**

1/8.7=sqrt(1-(v/c)^2-->[/b]

(1/8.7)^2=1-(v/c)^2-->[/b]

(v/c)^2=1-(1/8.7)^2-->[/b]

v/c=sqrt(1-(1/8.7)^2)-->[/b]

v/c=0.993372-->

v=0.993372c....which is incorrect, any assistance would be greatly appreciated[/b]

note: I also tried delta(t) to be 4.7...also incorrect