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A balloon rises straight up at 10m/s. An...

A balloon rises straight up at 10m/s. An observer is 40 m away from the spot where the balloon left the ground. Find the rate of change of the balloon's angle of elevation in radian per second when the balloon is 30 metres above the ground.

A

`(3)/(25)` radians/sec

B

`(4)/(25)` radians/sec

C

`(1)/(5)` radians/sec

D

`(1)/(3)` radians/sec

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The correct Answer is:
B
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PREMIERS PUBLISHERS-APPLICATIONS OF DIFFERENTIAL CALCULUS-Solution To Exercise 7.10
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