A block is sliding along inclined plane as shown in figure. If the acceleration of chamber is ‘a’ as shown in the figure. The time required to cover a distance L along inclined plane is

• A

  $\sqrt{\frac{2\mathrm{L}}{\mathrm{gsin}\mathrm{\theta }-\mathrm{acos}\mathrm{\theta }}}$

• B

  $\sqrt{\frac{2\mathrm{L}}{\mathrm{gsin}\mathrm{\theta }+\mathrm{asin}\mathrm{\theta }}}$

• C

  $\sqrt{\frac{2\mathrm{L}}{\mathrm{gsin}\mathrm{\theta }+\mathrm{acos}\mathrm{\theta }}}$

• D

  $\sqrt{\frac{2\mathrm{L}}{\mathrm{gsin}\mathrm{\theta }}}$