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`        At a distance of 4,000 ft from the launch site, a spectator is observing a rocket being launched. If the rocket lifts off vertically and is rising at a speed of 600 ft/sec when it is at an altitude of 3,000 ft, how fast is the distance between the rocket and the spectator changing at that instant?`
6 years ago

Chetan Mandayam Nayakar
312 Points
```										distance=s=√(40002+h2), rate of change of distance=ds/dt=(ds/dh)(dh/dt)=(d(√(40002+h2)/dh)(dh/dt),dh/dt=600 ft/sec
```
6 years ago
archit srivastava
14 Points
```										250/3 ft/sec using 2d figure
```
4 years ago
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