A body is allowed to slide from the top along a smooth inclined plane of length 5m at an angle of inclination 30º. If g = 10 $m{s}^{-2}$, time taken by the body to reach the bottom of the plane is

• A

  $\frac{\sqrt{3}}{2}s$
• B

  1.414s

• C

  $\frac{1}{\sqrt{2}}s$
• D

  2s