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A body oscillates with simple harmonic motion according to the equation x = 6.0 cos(3t +...

A body oscillates with simple harmonic motion according to the equation

x = 6.0 cos(3t + π/3)

where the units are SI. The speed of the body when it has a displacement of 3 m is...Can someone show me how to solve this problem step by step?

A. 6π m/s

B. 9π m/s

C. m/s

D. 18π m/s

E. m/s

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