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Help with all of them plsss

Help with all of them plsss-example-1
User Calvinf
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i):final velocity=initial velocity+acceleration due to gravity*time of travel

Therefore,
v=0+9.8*3.1
=30.38 m/s

If by floor you meant water bed then i think there isn't enough info in the question.
User Sayed Sohan
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