We mentioned in the text that the oscillation ceases altogether when c is increased to ccr or beyond. Let us make that statement more precise: for c ≥ ccr the graph of x(t) has at most one “flat spot” (on 0 ≤ t<∞), that is, where x′ = 0.
Make up a case where there is one flat spot on 0 ≤ t<∞.
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