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Q.

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? ( x is displacement , v is velocity, and a is acceleration )

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a

$x < 0, u < 0, a > 0$

b

$x > 0, u < 0, a < 0$

c

$x > 0, u < 0, a > 0$

d

$x > 0, u > 0, a < 0$

answer is A.

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Detailed Solution

Velocity and displacement are in downward direction while acceleration is in upward direction as it is retarding.

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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? ( x is displacement , v is velocity, and a is acceleration )