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in পদার্থ বিজ্ঞান by Excellent Pro (20.8k points)  

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by Earner (4.6k points)  
সময় এর সাথে যদি কোন বস্তুর বেগ বা গতি কমে যেতে থাকে, তাহলে ওই গতি কমে যাওয়াকে মন্দন বলে।  মন্দন না হলো কোন বস্তুর গতিই কমত না।

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