A Longitudinal Wave Travels on a Slinky or Any Long

A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation x(x, t) = 2.10 cm cos(2000 rad/s t + 40.0 m⁻¹ x) . What is the velocity of the wave?

A) 50 m/s in the + x direction
B) 50 m/s in the − x direction
C) 0.02 m/s in the + x direction
D) 0.02 m/s in the − x direction

Correct Answer:

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