As seen by one observer, two recrackers are set o at the same placebut separated by 4 seconds in time.As observed by a second observer, moving with respect to the rst,the two recrackers detonate at places separated by 3 light-seconds inspace.As observed by this second observer, how much time is there between the two detonations?How fast is this second observer moving with respect to the rst?
As seen by one observer, two recrackers are set o at the same place but separated by 4 seconds in time.
