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- Feb 4th 2009, 04:49 PM #1

- Joined
- Feb 2009
- Posts
- 18

## please help me with this question.

A spaceship approaching touchdown on a distant planet has height

*h*, in meters, at time*t*, in seconds, given by*h*=25*t*^2-100*t*+100. When does the spaceship land on the surface? With what speed does it land(assuming it descends vertically)?

Thanks

- Feb 4th 2009, 05:25 PM #2