Two dimensional acceleration question

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To calculate the average acceleration of a car changing its velocity from 25 m/s east to 25 m/s south over 15 seconds, first express the velocities in component form. The initial velocity is (25, 0) m/s and the final velocity is (0, -25) m/s. The change in velocity is found by subtracting the initial velocity from the final velocity, resulting in a vector of (-25, -25) m/s. Using the average acceleration formula, divide this change in velocity by the time interval of 15 seconds to find the average acceleration. This approach provides both the magnitude and direction of the acceleration.
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My book stinks it doesn't explain or show you how to do enough examples. But anyways i have another problem now. I figured out how to do my other question. Anyways my question is...

A car with a velocity of 25 m/s [E] changes its velocity to 25 m/s in 15s. Calculate the car's average acceleration.

How do i start this question off. I don't know what to do.
 
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Are we looking for a magnitude of acceleration or a vector form?
 
the magnitude and degrees/direction
 
Use the definition of average (vector) acceleration:
\vec{a}_{ave} = \frac{\Delta \vec{v}}{\Delta t}

(Hint: To find the change in the velocity, write the initial and final velocity in component form and then subtract.)
 

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