A car starts rolling down a 1-in-4 hill (1-in-r mean that for each 4m traveled along the

Question:

A car starts rolling down a 1-in-4 hill (1-in-r mean that for each 4m traveled along the road, the elevation change is 1 m). How fast is it going when it reaches the bottom after traveling 55m?
(a) Ignore friction.
(b) Assume an effective coefficient of friction equal to 0.10.