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The jet plane starts from rest at `s =0` and is subjected to the acceleration shown. Determine the speed of the plane when it has travelled 60 m. A. `46.47 m//s`B. `36.47 m//s`C. `26.47 m//s`D. `16.47 m//s` |
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Answer» Correct Answer - A `a=(dv)/(ds)v implies int_(0)^(S)a.ds=int_(u)^(v)v.dv=v^(2)-u^(2)` `implies"Area under" a~s "curve"=v^(2)-u^(2)` `implies((1)/(2)xx150xx22.5)-(1)/(2)(90xx13.5)=v^(2)-0` `impliesv^(2)=75xx22.5-45xx13.5` `impliesv=sqrt(75xx22.5-45xx13.5)implies46.47` |
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