A toy "spring gun" has a spring with a spring constant of 30,000 N/m and is depressed 4 cm. It shoots a plastic dart with a mass of 45 grams. How fast will the dart travel if there is no friction?

 32.66 m/s

Explanation:

The potential energy stored in the spring will impart kinetic energy into the dart:

substitute the values:

explanation:

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explanation: