Plot 2D Trajectory: Solve Initial Velocity & Coordinates

[rd42]

I'm trying to plot out the trajectory of an object in a program that is looping through the function and spitting out the x and y coordinates, but I'm having trouble. I want to see a parabola starting at 0,0 going up and ending again at x,0.

Basic question:

(units aren't critical here f/s m/s anything as long as they're all the same)
initial velocity in x = 50
initial velocity in y = 100

x coordinate:
x = v * t
x = 50 * 1
x1 = 50

y coordinate:
y = v + .5gt^2
y = 100 + -4.9
y1 = 95.1

I'm missing something here. How do I get the points along the path of the trajectory starting at 0,0 instead of starting at 0, 95.1 as the first coordinate?

Thanks,
rd42

 

[kuruman]

y coordinate:
y = v + .5gt^2
y = 100 + -4.9
y1 = 95.1

I'm missing something here. How do I get the points along the path of the trajectory starting at 0,0 instead of starting at 0, 95.1 as the first coordinate?

Thanks,
rd42

You mean y = 100*t -4.9*t²

You get point y1 when you set t =1 in the above equation. You get the earlier point y0 when you set t = 0 in the above equation.