The displacement y of a particle in a me...

The displacement y of a particle in a medium can be expressed as `y=-6sin(100t+20x+(pi)/(4))m` where t is in seconds and x in metres. The speed of the wave is:

A

`2000 ms^(-1)`

B

`5 ms^(-1)`

C

`20 ms^(-1)`

D

`5pi ms^(-1)`

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The correct Answer is:

B

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