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A::BSolution :

(a) Wave velocity `= ("Coefficient of t")/("Coefficient of x")` <br> `=((1//0.01))/((1//0.05)) = 5 m//s` <br> Since, coefficient of `t` and coefficient of `x` are of same sign. Wave is travelling in negative x-direction. <br> or `v= - 5m//s` <br> (b) Particle velocity, `v_(P) = (dely)/(delt)` <br> `=2 cos ((x)/(0.05) + (t)/(0.01))` <br> Substituting `x = 0.2` and <br> `t = 0.3`, we have <br> `= (2)(-0.85)` <br> `= - 1.7 m//s`