Acharge q moves from point a to point b in an electric field. the potential energy of the charge at point a is 9.4 × 10-13 joules, and its kinetic energy is zero. the kinetic energy at point b is 6.5 × 10-13 joules. what is the potential energy at b?

By energy conservation we will say

as we know that

also we have

now we will have

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