A particle is released from top of two inclined rough surfaces of height 'h' each. The angle of inclination of two planes are $30^{\circ}$ and $60^{\circ}$ respectively. All other factor (eg. coefficient of friction, mass of block etc) are same in both cases. Let $k_1$ and $k_2$ be kinetic energies of the particle at the bottom of the plane in two cases. Then

Question

$$(a)\;k_1=k_2 \quad (b)\;k_1 < k_2 \quad (c)\; k_1 > k_2 \quad (d)\;data\;insufficient$$