a body is moving along the boundary of a square plot of land with constant speed does its velocity remains unchanged
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On it keeps on changing as it cover unequal displacement in equal interval of time
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No, it's velocity doesn't remain unchanged. It changes when the boy changes his direction at the corner of the square plot. Velocity is constant when both its magnitude and direction are constant. It changes when either the direction or the magnitude(speed) changes. Here, speed is constant but direction is changing. So velocity is not constant.
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