Posted by **Anil** on Saturday, October 8, 2011 at 8:01pm.

why are these equations poor models of hitting a baseball:

y= -0.002x(x-433.1)

I get maximums of (216,93). Other problems' maximums are in the (220, 100)range. So are they poor models because the distance and heights are unreasonable?

2) Why is the constant a in y=ax^2 + bx + c negative in a reasonable model?

is it because the graph is then a hill versus a valley?

- algebra -
**Steve**, Saturday, October 8, 2011 at 8:17pm
1. Plenty of players hit the ball 400 feet or more. This function has roots at 0,433, so it appears to model typical hitting ability.

2. negative a means that there is a downward force acting on the ball: gravity. so, yes, the graph is a hill. The ball takes off at some speed, but gravity slows down its ascent and makes it drop back to earth.

- algebra -
**Damon**, Saturday, October 8, 2011 at 8:18pm
y= -0.002x(x-433.1)

is

y = .8662 x - .002 x^2

I do not see anything very wrong except that the baseball does not start out at zero height. When x = 0 y should be like one meter high so I might prefer something like

y = 1 + .8662 x - .002 x^2

Yes, coef of x^2 must be negative because as x gets big the ball must drop.

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