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Solution


Q.

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)          [2025]

Ans.

(2000)

vboat=vriver+vboat,river

              = 9 + 27 = 36 km/hr = 10 m/s

Time of flight = 2×1010 = 2 sec

Range = 10 × 2 = 20 m = 2000 cm.