give an example when the tangential acceleration is directed opposite to the direction of velocity .{in circular motion}

Actually in a circular motion the tangential acceleration is always zero. The acceleration is always directed towards the centre of the circle.

Though it is not possible for circular motion, we can see it for elliptical motion. For example when planet crosses perihelion, the magnitude of the velocity starts decreasing. At this points (between perihelion and aphelion) the tangential acceleration is opposite to the velocity.

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