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Can someone please help me on number 2 I am really stuck.
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3 votes
Can someone please help me on number 2 I am really stuck.

Can someone please help me on number 2 I am really stuck.-example-1
User Pontikos
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2 Answers

6 votes
second to last or last one 
User Tkane
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6.7k points
4 votes
A longitudinal wave. I'm 100% sure.

Hope this helps!
User Bentael
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