A block slides over 3 rough inclined plane having equal coefficient of friction and equal height but different slopes. The increase in kinetic energy will be greatest for:

Loss in Ug is same in all the given region.Work against friction =μmgcos⁡θhcosec⁡θ                                  =μmghcot⁡θ Gain in KE=mgh−μmghcot⁡θcot⁡θ is minimum for θ3.