Q: A lift is coming form 8th floor and is just about to reach 4 the floor. Taking ground floor as origin and positive direction upwards for all quantities, which one of the following is correct ?

(a) x < 0,v < 0, a > 0

(b)x > 0 , v < 0 , a < 0

(c) x > 0 , v < 0 , a > 0

(d) x > 0,v > 0,a > 0

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Ans: (a)