A student begins at rest and then walks north at a speed of vi-055 m/s. The student then turns south and walks at a speed of v2 0.61 m/s. Take north to be a positive direction. Refer to the figure. 

a) what is the students overall average velocity in meters per second for the trip assuming the student spent equal times at speeds v ₁ and v ₂

b) if the student travels in the state of directions for 30 seconds at speed v1 and for 20 seconds at speed V2, what is the net displacement, in meters, during the trip?

c) if it takes the student 5 seconds to reach the speed v1 from rest, what is the magnitude of the student's average acceleration, in meters per second squared, during that time?

South North