Which of the following is the name of the process scientists use to gain knowledge abut the physical world

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

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