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Question #75636

1 Answer

Dec 2, 2016

Time needs to be a positive quantity.

Explanation:

The kinematic equation connecting quantities of interest is
#v=u+at#

Inserting given values we get
#30=0+3.5t#

Solving for time #t# we get
#t=30/3.5=8.57s#, rounded to two decimal places, as given

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