Energy stored in spring = (1/2) k x^2 = .5 * 229 * (0.05)^2 Joules
so
Ke of puck = (1/2) m v^2 = .5 * 0.117 * v^2 Joules
set them equal and solve for v
In an arcade game a 0.117 kg disk is shot
across a frictionless horizontal surface by compressing it against a spring and releasing it.
If the spring has a spring constant of
229 N/m and is compressed from its equilibrium position by 5 cm, find the speed with
which the disk slides across the surface.
Answer in units of m/s.
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