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Grade: 12th pass
        
. A particle is moving in the i−j plane with an acceleration of (1 −t)i+tj where t is the time. The particle is projected from the origin with an initial velocity of 3 2 i ms−1 . Find the displacement of the particle at time t and the value of t when it is moving in a direction of motion. What is the angle between its velocity and displacement at this time?
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