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Find the 3 first moments (t >0) for which: (b) v x =-0.5 v max (v max is the maximum speed) x = A cos

Find the 3 first moments (t >0) for which: (b) v_x=-0.5 v_max (v _max is the maximum speed)

x = A cos (1.05t +3.67)

the answer is 3,5,9 seconds

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