Why is it difficult to maintain constant speed of a vehicle?​

Roads consist of curves, gutters, etc. Thus not allowing the vehicle to maintain a constant speed. Also it can be explained as due to a change in the frictional surface of the road. hope it help you.

The road surface is always rough, so the frictional force between the tires and the road surface make it difficult to maintain constant speed because acceleration always changes.

where's the following? you gotta add it to know what the choices are

explanation:

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles