A man is 9 m behind the door of a train when it starts
moving with acceleration a = 2m/s2. The man runs at full
speed. If he just gets into the train, then speed of the man is
(1) 6 m/s
(2) 12 m/s
(3) 3 m/s
(4) 9 m/
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the man run in speed of 9m/s
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