Snakes swim by vibrating their body from side to side, just like a transverse wave. The faster they vibrate, the faster they move through the water. A 90 cm long snake in a lake travels with a velocity of 1.8 m/s. At what frequency does it vibrate its body?

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Snakes swim by vibrating their body from side to side, just like a transverse wave. The faster they vibrate, the faster they move through the water. A 90 cm long snake in a lake travels with a velocity of 1.8 m/s. At what frequency does it vibrate its body?