A person standing on the floor of an elevator drops a coin. The coin reaches the floor in time ${t}_{1}$ if the elevator is moving uniformly and time ${t}_{2}$ if the elevator is stationary. Then:

 1 $$t_1t_2$$ depending upon whether the lift is going up or down. 2 $$t_1t_2$$ 4 $$t_1=t_2$$

Subtopic: Â Relative Motion in One Dimension |
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From NCERT
NEET - 2019
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Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time $$t_1$$. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time $$t_2$$. The time taken by her to walk upon the moving escalator will be:
1. $$\frac{t_1t_2}{t_2-t_1}$$
2. $$\frac{t_1t_2}{t_2+t_1}$$
3. $$t_1-t_2$$
4. $$\frac{t_1+t_2}{2}$$

Subtopic: Â Relative Motion in One Dimension |
Â 72%
From NCERT
NEET - 2017
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A bus is moving at a speed of $$10$$ ms-1 on a straight road. A scooterist wishes to overtake the bus in $$100$$ s. If the bus is at a distance of $$1$$ km from the scooterist, with what speed should the scooterist chase the bus?
1. $$20$$ ms-1
2. $$40$$ ms-1
3. $$25$$ ms-1
4. $$10$$ ms-1
Subtopic: Â Relative Motion in One Dimension |
Â 77%
From NCERT
AIPMT - 2009
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