A solid sphere & a hollow sphere of radius R are rolling down in inclined lane of height h. The ratio of velocities of solid sphere to Hollow sphere on reaching the bottom is
1
\(\sqrt {\frac{{21}}{{25}}}\)
2
\(\sqrt {\frac{{25}}{{21}}}\)
3
\(\sqrt {\frac{3}{5}}\)
4
\(\sqrt {\frac{5}{3}}\)