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4. A particle is projected at a speed of 12 ms-1 up a straight inclined track. Whilst on the track the particle experiences a constant

4. A particle is projected at a speed of 12 ms-1 up a straight inclined track. Whilst on the track the particle experiences a constant acceleration down the track of 5 ms-2 . Find the length of time that the displacement of the particle up the track from the point of projection is greater than 8 metre

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