Anything that moves in a path that's not straight can do that.
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If its speed is constant, its acceleration is nil.
The wavelength stays constant.
This may have been the result of steering the car around a curve in the road while maintaining constant speed.
30 km/hr
take different speed while you travels... then add it.... Divide it with number of speed taken.... eg: ( 60km\h 62km\h 69km\h 63km\h ..... then (60+62+69+63)/4 )