A particle moves in a straight line for 20 seconds with velocity 3 m/s and then moves with velocity 4 m/s for another 20 seconds and finally moves wit

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A particle moves in a straight line for 20 seconds with velocity 3 m/s and then moves with velocity 4 m/s for another ... /s B. 4 m/s C. 5 m/s D. zero

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