Physics

Problem

Find the speed of propagation of the wave

y=0.01\sin\bigl(\dfrac{2\pi x}{0.40}-180\pi t\bigr)

, where

x

is in metres and

t

in seconds. a)

18\,\text{m\,s}^{-1}

90\,\text{m\,s}^{-1}

36\,\text{m\,s}^{-1}

72\,\text{m\,s}^{-1}