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A transparent lift A is going upwards wi...

A transparent lift `A` is going upwards with velocity `20 ms^-1` and retarding at the rate of `8 ms^-2`. Second transparent lift `B` is located in front of it and is going down at `10 ms^-1` with retardation of `2 ms^-2`. At the same instant a bolt from the ceiling of lift `A` drops inside lift `A` Height of car of lift `A` is `16 m`. Find the time taken by boly to hit the floor of `A`.

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