JEE Main 2022 (Online) 29th June Morning Shift | Motion in a Straight Line Question 47 | Physics

Two balls A and B are placed at the top of 180 m tall tower. Ball A is released from the top at t = 0 s. Ball B is thrown vertically down with an initial velocity 'u' at t = 2 s. After a certain time, both balls meet 100 m above the ground. Find the value of 'u' in ms^$$-$$1. [use g = 10 ms^$$-$$2] :

JEE Main 2022 (Online) 25th June Evening Shift

MCQ (Single Correct Answer)

-1

Two buses P and Q start from a point at the same time and move in a straight line and their positions are represented by $${X_P}(t) = \alpha t + \beta {t^2}$$ and $${X_Q}(t) = ft - {t^2}$$. At what time, both the buses have same velocity?

$${{\alpha - f} \over {1 + \beta }}$$

$${{\alpha + f} \over {2(\beta - 1)}}$$

$${{\alpha + f} \over {2(1 + \beta )}}$$

$${{f - \alpha } \over {2(1 + \beta )}}$$

JEE Main 2021 (Online) 27th August Evening Shift

MCQ (Single Correct Answer)

-1

Water drops are falling from a nozzle of a shower onto the floor, from a height of 9.8 m. The drops fall at a regular interval of time. When the first drop strikes the floor, at that instant, the third drop begins to fall. Locate the position of second drop from the floor when the first drop strikes the floor.

4.18 m

2.94 m

2.45 m

7.35 m

JEE Main 2021 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

-1

A ball is thrown up with a certain velocity so that it reaches a height 'h'. Find the ratio of the two different times of the ball reaching $${h \over 3}$$ in both the directions.

$${{\sqrt 2 - 1} \over {\sqrt 2 + 1}}$$

$${1 \over 3}$$

$${{\sqrt 3 - \sqrt 2 } \over {\sqrt 3 + \sqrt 2 }}$$

$${{\sqrt 3 - 1} \over {\sqrt 3 + 1}}$$

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