Q128 / 180 · COMEDK 2024 (Afternoon Shift) · Physics
A man standing in a truck moving with constant velocity throws a ball vertically into air, ball falls
- Correct answerAExactly in the hand of the boy
- BOutside the truck
- CIn the truck behind the boy
- DIn the truck ahead of the boy
Solution
The truck is moving with a constant velocity $v$ in the horizontal direction. When the man throws the ball vertically upward, the ball possesses the same initial horizontal velocity $v$ as the truck and the man.
Since there is no horizontal acceleration acting on the ball (ignoring air resistance), its horizontal velocity remains constant at $v$ throughout the flight.
The truck also continues to move with the same constant horizontal velocity $v$.
Because both the ball and the truck cover the same horizontal distance in the same time interval, the ball remains directly above the point from which it was thrown relative to the truck.
Therefore, the ball falls exactly back into the hand of the man.
Answer: Exactly in the hand of the boy
Since there is no horizontal acceleration acting on the ball (ignoring air resistance), its horizontal velocity remains constant at $v$ throughout the flight.
The truck also continues to move with the same constant horizontal velocity $v$.
Because both the ball and the truck cover the same horizontal distance in the same time interval, the ball remains directly above the point from which it was thrown relative to the truck.
Therefore, the ball falls exactly back into the hand of the man.
Answer: Exactly in the hand of the boy
Hence, the correct answer is option: 'A'.