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MATTG99

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AL2006


               Kinetic Energy  =  (1/2) (mass) (speed)²

                         4,000 J  =  (1/2) (80 kg) (speed)²    

Divide each side
by  40 kg :            4,000 J / 40 kg  =  speed²

                                    100 m²/s²  =  speed²
Square root
each side:                         10 m/s  =  speed