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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 the 8th floor and is just about to reach the 4th floor. Taking the ground floor as the origin and the 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 the 8th to the 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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infoexpert22

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