29. ssm A jetliner, traveling northward, is landing with a speed of 69 m/s. Once the jet touches down, it has 750 m of runway in which to reduce its speed to 6.1 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing.

 

We know  ,   , and

 

We want  .  We know that acceleration is reducing speed so it must act in the opposite direction or south.  The equation we will use is

 

This equation removes the vector character so we must understand that a must be negative, which makes the equation

 

Now solving for a

 

 

 

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This page last updated on January 11, 2020