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//To Calculate the Time Elapsed between Door Openings
//Example 47.3
clear;
clc;
c=3*10^8;//Speed of Light in m/s
v=0.8*c;//Speed of Train T1 in m/s
y=1/sqrt(1-(v/c)^2);//Speed of Box in the frame of T1 in m/s
rl=30*c;//Rest Length of the box in metres
t=(rl*v*y)/(c^2);//Time elapsed between the openings of the Door in seconds
printf("Time elapsed between the openings of the Door = %.0f s",t);
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