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प्रश्न
Choose the correct alternative:
A balloon rises straight up at 10 m/s. An observer is 40 m away from the spot where the balloon left the ground. The rate of change of the balloon’s angle of elevation in radian per second when the balloon is 30 metres above the ground
पर्याय
`3/25` radians/sec
`4/25` radians/sec
`1/5` radians/sec
1/3` radians/sec
उत्तर
`4/25` radians/sec
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