$A$ force defined by $F = \alpha t^2 + \beta t$ acts on a particle at a given time $t$. The factor which is dimensionless,if $\alpha$ and $\beta$ are constants,is:
- A$\alpha t / \beta$
- B$\alpha \beta t$
- C$\alpha \beta / t$
- D$\beta t / \alpha$
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DifficultJEE MAIN 2019
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