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Given S=ut+1/2at^2,where u and a are con...

Given `S=ut+1/2at^2`,where u and a are constant , obtain the value of `ds/dt`

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`A =(3t^2+7)cm^2`
`dA/dt=d/dt (3t^2+7)=6t`
At t=5 sec
Da/dt=6xx5=30cm/sec.
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