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Unread 12-01-2006, 01:56
Tatsu Tatsu is offline
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Re: Nerf ball starting at 12m/s 45 degree angle ending at 8ft 6in w/ air resistance

Quote:
Originally Posted by Mirza95vx
Air resistance is not a factor unless you are going 75+ mph. So you dont have to account air resistance into the equation.
You're kidding right? You lose around 4 meters to air resistance fireing 45 degrees from 0 -> 0 at 12 m/s. This is fairly nontrivial. Initial deceleration is easy to calculate

F= 1/2 Cd * rho * A * v^2

for a poof ball, thats's about

F= 7.52e-3 * v^2

F= 1.08 Newtons.. that may seem insignificant.. but the poof ball is light..

F=ma=1.08 , so taking m = .18 kg we get a = 6.016 m/s^2 deceleration..

yes, that's about 2/3rds g, that's nontrivial.
 


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