Posted by **SIMP( secret important person)** on Thursday, September 24, 2009 at 9:50pm.

WHICH FORMULA DO I USE AND HOW DO I WORK IT OUT? I SERIOUSLY NEED HELP!

use the formula h=rt-4.9t^2 when h is in meters and h=rt-16t^2.

A rocket is fired upward with an intial speed of 1960m/s. After how many minutes does it hit the ground?

- algebra 1 -
**Reiny**, Thursday, September 24, 2009 at 10:17pm
The first formula is for metric units (h is in metres), the second for Imperial units (h is in feet) .

If you live in the US, use the second, if you live elsewhere, use the first.

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