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Question #6e1a6

1 Answer

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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