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You are standing at x=9.0km and your assistant is standing at x=2.0km. Lightning bolt 1 strikes...

You are standing at x=9.0km and your assistant is standing at x=2.0km. Lightning bolt 1 strikes at x=0km and lightning bolt 2 strikes at x=15.0km. You see the flash from bolt 2 at t=20μs and the flash from bolt 1 at t=60μs.

According to your assistant, were the lightning strikes simultaneous?

Part A. According to your assistant, were the lightning strikes simultaneous?

Yes, the lightning strikes simultaneous.
No, the lightning bolt 1 strikes first.

No, the lightning bolt 2 strikes first.

Part B. If not, what was the time difference between the two?

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