Solution: How fast is the balloon receding from the observer 10 seconds later?

A balloon is released from the ground 100 meters from an observer. The balloon rises directly upward at the rate of 4 meters per second. How fast is the balloon receding from the observer 10 seconds later?

How fast is the balloon receding from the observer 10 seconds later?

Problem Statement: ECE Board November 1991

A balloon is released from the ground 100 meters from an observer. The balloon rises directly upward at the rate of 4 meters per second. How fast is the balloon receding from the observer 10 seconds later?
  • A. 1.68 m/sec
  • B. 1.36 m/sec
  • C. 1.55 m/sec
  • D. 1.49 m/sec

Problem Answer:

The balloon receding from the observer at 1.49 m/sec

Solution:

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