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A lift is coming from `8th` floor and is just about to reach `4th` floor. Taking ground floor as origin and positive direction upwards for all quantities, which one of the following is correct ?A. x gt 0, v lt 0, a gt 0B. x gt 0, v lt 0, a lt 0C. x gt 0, v lt 0 , a gt 0D. x gt 0, v gt 0 a lt 0 |
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Answer» Correct Answer - (a) As lift is coming from `8^(th) to 4^(th)` floor, it is retarding, i.e., a is acting upwards, so, a gt 0 and the value of x becomes less hence negative, i.e., x lt 0, velocity is downwards(i.e., negative) so, v lt 0. |
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