Posted by **Erin** on Monday, October 17, 2011 at 4:52pm.

The height of a ball thrown vertically upward from a rooftop is modelled by h(t)=-5t^2=20t=50, where h(t) is the ball's height above the gorund,in meters, at time t seconds after the throw

a) determine the maximum height of the ball

b) how long does it take for the ball to reach its maximum height

c) how highis the rooftop

- Math( help please ! ) -
**Mike**, Monday, October 17, 2011 at 4:56pm
Read the problem carefully and if you still don't understand let me know :D

- Math( help please ! ) -
**Reiny**, Monday, October 17, 2011 at 6:11pm
Your equation makes no sense, make sure you read what you typed before posting.

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