Q53 / 55 · KVPY 2020 (SA) · Physics
Three balls, and , are released and all reach the point (shonw in the figure). Balls and are released from two identical structures, one kept on the ground and the other at height, , from the ground as shown in the figure. They take time and respectively to reach (time starts after they leave the end of the horizontal portion of the structure). The ball is released from a point at height, , vertically above and reaches in time . Choose the correct statement.

Three balls, and , are released and all reach the point (shonw in the figure). Balls and are released from two identical structures, one kept on the ground and the other at height, , from the ground as shown in the figure. They take time and respectively to reach (time starts after they leave the end of the horizontal portion of the structure). The ball is released from a point at height, , vertically above and reaches in time . Choose the correct statement.

- A
- Correct answerBta = tb = tc
- C
- D
Solution
Work done by gravity on and is same.
Horizontal velocity of horizontal velocity of as they leave the horizontal portion of the structure.
Also vertical velocity of and vertical velocity of when released are both zero
They both will cover same vertical distance in same time.
From and
Note : Correction in option option B should be
Hence, the correct answer is option: 'B'.