Question 50

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 = $$10 m/s^{2}$$)


Correct Answer: 2000

Solution

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Boat speed downstream = 27+9 = 36 km/h = 10 m/s. Ball thrown at 10 m/s upward.

Time of flight = 2u/g = 2Ă—10/10 = 2s. Range = horizontal speed Ă— time = 10Ă—2 = 20m = 2000 cm.

The answer is 2000.

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