A jetliner, traveling northward, is landing with a speed, Ask an Expert

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A jetliner, traveling northward, is landing with a speed of 65 m/s. Once the jet touches down, it has 715 m of runway in which to reduce its speed to 6.0 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the positive direction to be northward).

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