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Homework Statement
A heavy-duty stapling gun uses a 0.151-kg metal rod that rams against the staple to eject it. The rod is pushed by a stiff spring called a "ram spring" (k = 35007 N/m). The mass of this spring may be ignored. Squeezing the handle of the gun first compresses the ram spring by 3.9 multiplied by 10-2m from its unstrained length and then releases it. Assuming that the ram spring is oriented vertically and is still compressed by 1.0 multiplied by 10-2m when the downward-moving ram hits the staple, find the speed of the ram at the instant of contact.
Homework Equations
U=(1/2)kx^2
(1/2)kx^2=(1/2)mv^2
The Attempt at a Solution
I have no idea what to do. My answer was 13.96 m/s but it was wrong.
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