Vertical displacement

Two things:
1) You should be checking other peoples' work. :)

2) "about 2.908 seconds" sounds a little funny. Given the provided assumptions, it will be really, REALLY close to 2.908 seconds. If you're going with "about", maybe "2.9" would be a good number, or maybe "3"?

Your work is good. Have some confidence about it.
 
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