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January 30, 2015

January 30, 2015

Posted by **TrACY** on Thursday, April 26, 2012 at 12:22pm.

- MATH -
**bobpursley**, Thursday, April 26, 2012 at 12:45pmif height y is

y= 4.9t^2+ 68.6t, it is a very odd object, gravity is not going to ever pull it downward. I suggest this is more likely in the real world:

y= - 4.9t^2+68.6t

so y max can be found when

y'=0=-9.8t+68.6 and solve that for t, the time at the max.

then put that t into the y equation.

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