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# Find the instantaneous velocity (intro to analysis)?

Suppose the position of an object moving in a straight line is given by s(t) = 5t^3 - 7t^2 + 9.

Find the instantaneous velocity when t=7.

The answer I got was incorrect so I need some help. Thank you!

You take the limit of [ f(x+h) - f(x) ] / h

### 2 Answers

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- RealProLv 72 years agoFavorite Answer
Derivative of position with respect to time is 15t^2 - 14t.

Plug t = 7 into that. This is the instantaneous velocity at that moment.

- Anonymous2 years ago
6

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