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Charles Cansado launched a 200 g dart upwards from a height of 100 cm using a toy gun. The stiffness of the gun's spring is

Charles Cansado launched a 200 g dart upwards from a height of 100 cm using a toy gun. The stiffness of the gun's spring is 1 000 N/m which was compressed 12 cm. Determine the impact velocity of the dart the instant it reaches its target at a height of 300 cm if the heat loss was 1.28 J. Determine the percentage efficiency of the shot.

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