An object experiences an acceleration of 9.8 m/s over a distance of 210 m. After that acceleration it has a velocity of 380 m/s. What was its velocity before being accelerated

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

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide