In a horizontal spring-mass system, mass $m$ is released after being displaced towards the right by some distance at $t = 0$ on a frictionless surface (Figure 5.122). The phase angle of the motion, in radian, when it first passes through the equilibrium position is:

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With x = A sin ( ω t + ϕ ) and x = + A at t = 0 , ϕ = π /2 . The block first reaches x = 0 when ω t + ϕ = π .

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