Do you explain this question? Is my solution correct?

hey , which is the correct answer ,600?

E is correct answer!

Hi! So it travels the 8 metres to hit the wall and then back to the point and another further 2 metres to hit the other wall then reflect another 2 metres back to the original point. therefore it is a total of 12 m.

12 / 0.001 s = 1200 ms-1

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