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( R ) বিন্দুতে বস্তুর ভর ( m=2 ) ( begin array l kg, overrightarrow r =( hat i -2 hat j +b hat k ) m overrightarrow v =(2 hat i -4 hat j +2 hat k ) m s^ -1 , overrightarrow P = ভরব | Suva Ai