The position $x$ of a particle at time $t$ is given by $x=\frac{V_{0}}{a}\left(1-e^{-\alpha t}\right)$,…

The position $x$ of a particle at time $t$ is given by $x=\frac{V_{0}}{a}\left(1-e^{-\alpha t}\right)$, where $V_{0}$ is constant and $a >0$. The dimensions of $V_{0}$ and $a$ are
  1. $M^{0} L T^{-1}$ and $T^{-1}$
  2. $M^{0} L T^{\circ}$ and $T^{-1}$
  3. $M^{0} L T^{-1}$ and $\mathrm{LT}^{-2}$
  4. $M^{0} L T^{-1}$ and $T$

Solution

Here, $a t$ is dimensionless
$\Rightarrow a=\frac{1}{t}=\left[\frac{1}{T}\right]=\left[T^{-1}\right]$
$x=\frac{V_{0}}{a}$ and $V_{0}=x a=\left[L T^{-1}\right]=\left[M^{0} L T^{-1}\right]$ ^

Asked in: JEE Mains - Units and Dimensions - Test 2

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