and whats your point numb nuts.i can't believe you really care about something so pointless,get a life sorry but your a real sorry sounding cu@t .
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need to know the speed of the wave at the speed of light 300,000,000 m/s 300,000,000 / 20 = 15,000,000 metres at the speed of sound 333 m/s 333 / 20 = 16.67 metres
90 mph
Speed = 30 mpsTime = 20sDistance = speed * timeDistance = 30 * 20 = 600 meters.
Frequency = (speed)/(wavelength) = 20/2 = 10 Hz
Its initial speed cannot be 20 m, as stated in the question. Secondly, if the initial speed is correctly given, then there is no need to calculate it!