Question #6e1a6

1 Answer
Nam D.
Feb 26, 2018

8.5 \ "m/s"

Explanation:

Using the kinematics equation, v=u+at

We got: v=21.4 \ "m/s", a=0.86 \ "m/s"^2, t=15 \ "s", so we get

21.4 \ "m/s"=u+0.86 \ "m/s"^2*15 \ "s"

21.4 \ "m/s"=u+12.9 \ "m/s"

u=21.4 \ "m/s"-12.9 \ "m/s"

u=8.5 \ "m/s"

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