A hydrogen filled balloon ascending at the rate of 18 kilometre per hour was drifted by wind .Its angles of elevation at 10th and 15 minutes were found to be 60 degree and 45 degree respectively.The wind speed during the last 5 minutes approximately is equal to
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The average speed of the wind is = 33.2 Km/h
Explanation:
According to the figure
x = AC - AB
= 4500/tan 45 - 3000/tan 60
= 4500 - 3000/√3 x √3/√3
= 4500 - 1000√3
x = 4500 - 1732
= 2758 m
Now average wind speed
= 2768/5 x 60/1000
= 2768 x 12/1000
= 33.2 Km/h
The average speed of the wind is = 33.2 Km/h
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