Question: A block is kept on a frictionless inclined surface with angle of inclination $\alpha$. The incline is given an acceleration a to keep the block stationary. Then a is equal to-
$\mathrm{g} / \tan \alpha$
$g \operatorname{cosec} \alpha$
$\mathrm{g}$
$\operatorname{gtan} \alpha$
Correct Option: , 4
Solution:
