If a block of mass m lying on a frictionless inclined plane of length L, height h and angle of inclination θ, then the time take taken to reach the bottom is –
(a) g sing θ
(b) sin θ \(\sqrt {\frac{2h}{g}}\)
(c) sin θ \(\sqrt {\frac{g}{h}}\)
(d) \(\frac{1}{sinθ}\) \(\sqrt {\frac{2h}{g}}\)