 
<translate> A cewar kimiyyar lissafi, yayin da wani abu ke juyawa, yana samun saurin. Tare da kowane juyi a kan downside, da yawan lokacin da ya rools kara wanda take kaiwa zuwa gare shi samun gudun. Don haka, amsar karshe ita ce samun saurin. <eng> According to physics, as a objects rolls, it gains speed. With every rool on downside, the number of time it rools increase which leads to it gaining speed.
So, the final answer is gain speed. 