[填空题]
A car starts rollingr9m87( 4jyvgvejw( td *xp)5qs1 kfob down a 1-in-4 hill (1-in-4 means that for each 4 m traveled along the road, the elevation change is 1 m). How f1pkx5 f)*sq boast is it going when it reaches the bottom after traveling 55 m? (a) Ignore friction.
(b) Assume an effective coefficient of friction equal to 0.10.
