Acar traveling in a straight line has a velocity of 6.64 m/s at some instant. after 5.55 s, its velocity is 10.9 m/s. what is its average acceleration in this time interval?

We calculate the average acceleration by formula,

Here vi  is initial velocity of the car and after given time its velocity becomes vf .

According to question,

,

Therefore, putting these values in above equation, we get

 a_{avg} = \frac{10.9 m/s - 6.64 m/s}{5.55 s}  

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Thus, the average acceleration in given time interval is

not too sure thinking all accelerations are pointed down