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MathGroup Archive 2009

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newbie here,, need help with parametrics

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96455] newbie here,, need help with parametrics
  • From: "R.J." <nemocamaro at epix.net>
  • Date: Sat, 14 Feb 2009 03:07:05 -0500 (EST)

I am using Mathematica and i'd rather be using derive,,,,, but anyways,,  heres the problem i have to do, a baseball is thrown from the stands 32 feet from the ground at an angle of 30 degrees above the horizontal, initial velocity is 32 feet per second.

what i want to do is find how to plot this in mathematica,, the graph i keep getting says it hits the ground after .8 seconds,   and i know thats not right,,, here is the formula i am using

r = (x + v Cos a) t) i + (y + (v Sin a) t - 1/2 gt^2) j

where x is the initial x position and y is the initial height, v is the initial velocity a is the angle (30*) t is time and g is the gravitational constant..

i'm stuck,,, any help?


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