# A plumb line is suspended from a ceiling of a car moving with horizontal acceleration of𝑎. What will be the angle of inclination with vertical?

Question : A plumb line is suspended from a ceiling of a car moving with horizontal acceleration of𝑎. What will be the angle of inclination with vertical?

(A) $\tan ^{-1}\left( \dfrac{a}{g}\right)$

(B) $\tan ^{-1}\left( \dfrac{g}{a}\right)$

(C) $cas ^{-1}\left( \dfrac{a}{g}\right)$

(D) $cas ^{-1}\left( \dfrac{g}{a}\right)$