Question

1. Special Relativity: Consider a firecracker that after being triggered explodes after 1 second. An observer A is standing some distance away from observer B who is traveling with constant velocity towards A with the firecracker. The velocity of B and distance between A and B is such that B will reach A in 1 sec as measured by A. At this instant B triggers the firecracker they are holding. Which of following options is correct?

   1. The firecracker explodes exactly when B reaches A

   2. The firecracker explodes before reaching A

   3. The firecracker explodes after crossing A

   4. All the above outcomes are possible

   Explain your answer. Include diagram in your explanation. Hint : this is not about time dilation.

Answer 1