InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
At a metro station, a girl walks up a stationary escalator in time `t_1` If she remains stationary on the escalator, then the escalator take her up in time `t_2`. The time taken by her to walk up the moving escalator will be.A. `((t_(1)+t_(2)))/(2)`B. `(t_(1)t_(2))/((t_(2)-t_(1)))`C. `(t_(1)t_(2))/((t_(2)+t_(1)))`D. `t_(1)-t_(2)` |
|
Answer» Correct Answer - C In this question, we have to find net velocity with respect to the Earth that will be equal to velocity of the girl plus velocity of escalator. Let displacement is L, then velocity of girl `upsilon_(g)=(L)/(t_(1))` velocity of scalator `upsilon_(e )=(L)/(t_(2))` Net velocity of the girl `= upsilon_(g)+upsilon_(e )=(L)/(t_(1))+(L)/(t_(2))` If t is total time taken in covering distance L, then `(L)/(t)=(L)/(t_(1)+(L)/(t_(2))` `rArr t=(t_(1)t_(2))/(t_(1)+t_(2))` |
|