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explain the waves travel along a spring when it is pushed and pulled at one end are longitudinal wave.

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When you pull a spring and leave it,it moves to and fro right? the waves along this also move to and fro in the same direction.that is why they are longitudinal waves.(Longitudinal waves are the waves which vibrate along the direction of movement.The waves in a spring move along the direction in which you pulled it so they are longitudinal.)



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