A Spring-Powered Dart Gun Is Unstretched and Has a Spring

A spring-powered dart gun is unstretched and has a spring constant 16.0 N/m. The spring is compressed by 8.0 cm and a 5.0 gram projectile is placed in the gun. The kinetic energy of the projectile when it is shot from the gun is

A) 0.125 J.
B) 0.090 J.
C) 0.075 J.
D) 0.051 J.
E) 0.030 J.

Correct Answer:

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