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A helium balloon leaves the ground at a point A and rises vertically............what is the speed of the balloon in m/s?

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A helium balloon leaves the ground at a point A and rises vertically at uniform speed.
At the end of 5 minutes, Rohan finds the angular elevation of the balloon as 30 degree.
If the point at which Rohan is standing is 550 m away from point A, what is the speed of the balloon in m/s?

posted Oct 4, 2019 by Samardeep Acharya

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1 Answer

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1.06 m/sec


E- elevation
D- distance = 550 m
Time- 5 min
S- speed= ?


E/D=tan(30 deg) --> E=D*tan(30 deg)= 550m * 0.577=317.54 m
S=317.54 m/5 min= 317.54 m/ 300 sec= 1.06 m/sec

answer Oct 5, 2019 by Hanifa Mammadov



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