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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 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 < 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

Answers (1)

The correct answer is the option (a) x < 0, v < 0, a > 0

Explanation: The value of x becomes negative as the lift comes downward, i.e., from 8th to 4th floor, thus, x<0.

Velocity is downward, i.e., negative, thus, v<0.

The lift retard before reaching the 4th floor and hence the acceleration will be upwards, i.e., a>0.

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