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means that velocity is changing by 2 m/s² . 
because acceleration is change in velocity.
i hope it helps......
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Hello !
Acceleration of -2 m/s² means retardation or the decreasing acceleration
It means if a body is moving at a particular velocity ,its speed or the velocity will decrease be 2 m/sec in each second as it is moving.
I hope u have got it !
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