An elevator without a ceiling is ascending up with an acceleration of `5 ms^-2.` A boy on the elevator shoots a ball in vertical upward direction from a height of 2 m above the floor of elevator. At this instant the elevator is moving up with a velocity of `10 ms^-1` and floor of the elevator is at a height of 50 m from the ground. The initial speed of the ball is `15 ms^-1` with respect to the elevator. Consider the duration for which the ball strikes the floor of elevator in answering following questions. (`g=10 ms^-2`) 4. The maximum separation between the floor of elevator and the ball during its flight would beA. 12 mB. 15 mC. 9.5 mD. 7.5 m

An elevator without a ceiling is ascending up with an acceleration of

1.	An elevator without a ceiling is ascending up with an acceleration of `5 ms^-2.` A boy on the elevator shoots a ball in vertical upward direction from a height of 2 m above the floor of elevator. At this instant the elevator is moving up with a velocity of `10 ms^-1` and floor of the elevator is at a height of 50 m from the ground. The initial speed of the ball is `15 ms^-1` with respect to the elevator. Consider the duration for which the ball strikes the floor of elevator in answering following questions. (`g=10 ms^-2`) 4. The maximum separation between the floor of elevator and the ball during its flight would beA. 12 mB. 15 mC. 9.5 mD. 7.5 m
Answer» Correct Answer - C At maximum separation, their velocities are same `:. 25--10t=10+5t` or `t=1s` Maximum separation =`2+S_2-S_1` `=2+[25xx1-5xx(1)^2]-[10xx1+2.5(1)^2]` `=9.5m`

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