1.

The distance covered by a particle varies with as `x=k/b(1-e^(-bt))`. The speed of particle at time `t` isA. `ke^(-bt)`B. `kb e^(-bt)`C. `(k/b^(2))e^(-bt)`D. `(k/b)e^(-bt)`

Answer» Correct Answer - A
`x=k/b(1-e^(-bt))`
`v=(dx)/(dt)=k/b{0-e^(-bt)(-b)}`
`=k e^(-bt)`


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