[填空题]
A car starts rolling down a 1-in-4 hill zm)nrzjedmp(7.- pp 7( wmyfu, (+xifaytyg3z4v1l(6 kf /xl-1-in-4 means that for each 4 m traveled along the road, the elevation change is 1 m). How fast is it going when it reaches the bottom after traveling w k-vu + f(y1gfl xixf 3/6y,yamzl(4t55 m? (a) Ignore friction.
(b) Assume an effective coefficient of friction equal to 0.10.
