Problem 20: A student begins at rest and then walks north at a speed of VI = 0.35 sz. The student then turns south and walks at a speed of v; = 0.74 mis. Take north to he the positive direction. Refer to the gure . I 15\" 'Fl'i' mun Part (a) What is the student's overall average velocity \"avg: in meters per second for the trip assuming the student spent equal times at speeds v1 and v2? Numeric : A numeric value is expected and not an expression. 1v."ll = Part (I!) Ifthe student travels in the stated directions for 30.0 seconds at speed v1 and for 23.0 seconds at speed it; what is the net displaoement , in meters, during the trip? Numeric : A numeric value is expected and not an expression. J = Part (c) If it takes the student 5.0 s 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? Numeric : A numeric value is expected and not an expression. a\