If y(x, t) = (5.2 mm) sin[kx + (450 rad/s)t + φ] describes a wave traveling along a string, how much time does any given point on the string take to move between displacements y = +3.4 mm and y = -3.4 mm?

i think the answer would be reserve.

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

option number c is the right answer.