Posted by Anya on Wednesday, March 6, 2013 at 2:07am.
I think this problem has a figure given, but it can't be shown. Well I think it's ok.
Acceleration is equal to change in velocity over time. Note that is a vector quantity, so it is represented by magnitude and direction. In the problem, since it slows down, it is termed as deceleration. The deceleration of the car is equal to 25 m/s / 10s = 2.5 m/s^2.
Since I don't know what direction the car is initially traveling, the answer can be the 1st or 2nd choices. But if there is figure given, if the car initially travels South, it decelerates at North direction, or if the car travels North, it decelerates at South direction.
Hope this helps~ :)
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