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Isaac Physics - Sketching Travel Time of Reflected Wave

I can't seem to get Part E of this question right (I have all other parts correct). Could anyone perhaps give me a hint? I have tried symmetric x=0 and none, neither of which were correct...
The question: https://isaacphysics.org/questions/graph_sketch_6_seismic_L?board=bb0ca135-6a9e-43e9-9f31-70acd7759f72&stage=a_level
Original post by sillycon
I can't seem to get Part E of this question right (I have all other parts correct). Could anyone perhaps give me a hint? I have tried symmetric x=0 and none, neither of which were correct...
The question: https://isaacphysics.org/questions/graph_sketch_6_seismic_L?board=bb0ca135-6a9e-43e9-9f31-70acd7759f72&stage=a_level

They (Isaac Physics) acknowledge that there is a mistake in part E. You can try it again.
Reply 2
Original post by Eimmanuel
They (Isaac Physics) acknowledge that there is a mistake in part E. You can try it again.

Thank you! It worked now
Original post by sillycon
Thank you! It worked now

I find the answer to this part weird.
Reply 4
Original post by Eimmanuel
I find the answer to this part weird.

Yes, I find it odd since the only seem to want the positive part of the graph in the other parts…

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