When a 0.5 kilogramme hockey puck hurtles at the goaltender, its acceleration in the glove is 800 m/s2. F=ma a=F/m a=400/0.5 a=800 m/s2.
Acceleration refers to any process where velocity varies. There are only two ways to accelerate: either by speeding up your acceleration or by reversing your acceleration. Because velocity consists of both a speed and a direction, this is the case. You cannot possibly be accelerating if you don't also alter your direction and speed, regardless of how swiftly you are travelling. As a result, a jet does not suffer acceleration even while moving at a high speed—in this example, 800 miles per hour—because its velocity is constant.
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