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A negative acceleration has the affect of decreasing the velocity of the moving object.

If a plane is climbing at a speed of 100 meters per second and is subject to an acceleration of -20 meters per sec2 then after 1 second it's climbing speed will reduce to 80 mps, after 2 seconds to 60 mps .....and so on.

This is illustrated by the law of motion v = u + ft, where u is the initial velocity, v is the final velocity, f is the acceleration and t is the time.

How long does it take the plane to reach a zero climbing velocity.

v = u + ft : 0 = 100 -20t : 20t = 100 : t = 5 seconds, which can be easily verified from the example a few lines above.

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Q: What is an acceleration of negative 20 meters per second squared?
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