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[" 55.An open lift is toming down from t...

[" 55.An open lift is toming down from the top of a building "],[" at a constant speed "v=10m/s" .A boy standing on the "],[" lift throws a stone vertically upwards at a speed of "30],[" m/s w.rt.himself.The time after which he will catch "],[" the stone is: "],[[" (a) "4sec," (b) "6sec],[" (c) "8sec," (d) "10sec]]

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