A ship is moving, with a speed of 48 km/hr, along the direction 13 î - 2ị + 3Ř. Its velocity is (1) 4 ( 13 î - 2 + 3) (2) 12( 3 i - 2 +3k) (3) 12 (3î - 2ſ + 13 k) (4) 12 ( 111 i - V2 + v3 )
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