defence exam Navy SSR (Medical) Mock Test Series 2025 Physics Waves The speed of a travelling wave

The equation of a transverse wave travelling along a string is y(x, t) = 4.0 sin [20 × 10–3 x + 600t] mm, where x is in the mm and t is in second. The velocity of the wave is :

1
+ 30 m/s
2
– 60 m/s
3
– 30 m/s 
4
+ 60 m/s
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