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A speeding powered dart gun is unstitched and has a spring constant 200 N/m. The spring is compressed by 0.05 m and a 0.05 kg

A speeding powered dart gun is unstitched and has a spring constant 200 N/m. The spring is compressed by 0.05 m and a 0.05 kg projectile is placed in the gun. The kinetic energy of the projectile when it is shot from the gun is?

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