At t = 0, an automobile traveling north begins to make a turn. It follows one-quarter of the arc of a circle of radius 9.3 m until, at t = 1.38 s, it is traveling east. The car does not alter its speed during the turn.

Question

(a) Find the car's speed.

(b) Find the change in its velocity during the turn.

(c) Find its average acceleration during the turn.

Answer 1

a) The car's speed does not change. They told you that.
b) The speed stays the same but the direction changes by 90 degrees. Draw a vector triangle. The velocity change is the hypotenuse of a 45 degree right triangle.
c) Divide the velocity change vector (from (b)) by the elepased time, 1.38 s