Given the approximation
show that the equation of motion for the mass m when it is released from rest at x = x0from the slingshot can be written as
where
Assume that the cords connecting the mass to the slingshot are linear springs with spring constant k, length L, and unstretched length L0. Ignore gravity and assume L > L0. Equation (2) is a famous differential equation in mechanics called Duffing’s equation.
Figure P3.37
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