An open lift is coming down from the top of a building at a constant speed v=10 m/s. A boy standing on the lift throw a stone vertically upwards at a speed of 30 m/s w.r.t. himself. The time after which he will catch the stone is:

An open lift is coming down from the top of a building at a constant s

1.	An open lift is coming down from the top of a building at a constant speed v=10 m/s. A boy standing on the lift throw a stone vertically upwards at a speed of 30 m/s w.r.t. himself. The time after which he will catch the stone is:
Answer» An open lift is coming down from the top of a building at a constant speed v=10 m/s. A boy standing on the lift throw a stone vertically upwards at a speed of 30 m/s w.r.t. himself. The time after which he will catch the stone is:

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An open lift is coming down from the top of a building at a constant speed v=10 m/s. A boy standing on the lift throw a stone vertically upwards at a speed of 30 m/s w.r.t. himself. The time after which he will catch the stone is:

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