A student begins at rest and then walks north at a speed of v1 = 0.65 m/s. The student then turns south and walks at a s

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A student begins at rest and then walks north at a speed of v1 =
0.65 m/s. The student then turns south and walks at a speed of v2 =
0.55 m/s. Take north to be the positive direction.
a) What is the student's overall average
velocity vavg, in meters per second, for
the trip assuming the student spent equal times at
speeds v1 and v2?
b) If the student travels in the stated directions for 30.0
seconds at speed v1 and for 20.0
seconds at speed v2, what is the net
displacement, in meters, during the trip?
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?