Posted by **Amanda** on Thursday, October 11, 2012 at 10:24am.

A rock is thrown upward at a speed of 10 metres per second. The height of the rock above the ground is given by the formula h=10t-2.0tÂ². Where h is the height in metres above the ground and t is the time in seconds. Then what is height after 5 second?

- Polynomials -
**Reiny**, Thursday, October 11, 2012 at 10:42am
If this took place on earth, I have no clue where you got this equation from, should have been

h =10t - 4.9t^2 , unless somebody changed the laws of gravity.

but,...

when t=5

h =10(5) - .2(25) = .....

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