- #1
jbjohnybaker
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Homework Statement
A child's toy shoots a rubber dart of mass 7.8g, using a compressed spring with a force constant of 3.5 x 10^2 N/m. The spring is initially compressed 4.5cm. All the elastic potential energy is converted into kinetic energy of the dart.
What is the speed of the dart as it leaves the toy?
Homework Equations
Ee = Ek
Ee = 1/2 k x^2
Ek = 1/2 mv^2
The Attempt at a Solution
Ee = Ek
1/2 (3.5 x10^2)(?) = 1/2 (.0078)v^2 ??]