Answer:

Explanation:
The elastic potential energy of a spring is given by
, where
is the spring constant of the spring and
is displacement from point of equilibrium.
When released, this potential energy will be converted into kinetic energy. Kinetic energy is given by
, where
is the mass of the object and
is the object's velocity.
Thus, we have:

Substituting given values, we get:

The answer is a.12.5kg because i just did the test and it was correct.
hope this helps
Answer:
No
Explanation:
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The gunstock it’s also called stock or shoulder stock