Question:
The maximum speed of a boat in still water is 27 km/h. Now this boat is moving downstream in a river flowing at 9 km/h. A man in the boat throws a ball vertically upwards with speed of 10 m/s. Range of the ball as observed by an observer at rest on the river bank is cm. (Take g = 10 m/s²).
The maximum speed of a boat in still water is 27 km/h. Now this boat is moving downstream in a river flowing at 9 km/h. A man in the boat throws a ball vertically upwards with speed of 10 m/s. Range of the ball as observed by an observer at rest on the river bank is cm. (Take g = 10 m/s²).
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For projectile motion, the range is affected by both the initial velocity and any horizontal motion of the observer.
Updated On: Jan 14, 2026
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Correct Answer: 100
Solution and Explanation
The horizontal velocity of the boat is 9 km/h, converted to m/s as 2.5 m/s. This horizontal velocity adds to the horizontal velocity of the ball, and the range is calculated using the projectile motion equations.
Thus, the correct answer is 100 cm.
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