(adsbygoogle = window.adsbygoogle || []).push({}); Projectile Motion, Shooting a Ball in Zero Gravity. URGENT!

So I had to come up with my own problem for class, but this is going to be in zero gravity. I chose lacrosse.

1. The problem statement, all variables and given/known data

Chris Fiore does a split dodge with the help of a pick and gets his hands free for a sidearm shot from 15 yards. He is so good that when he shoots, the ball always travels in a 2D path! The initial velocity of the shot is 96mi/h (Chris Fiore is one of the fastest shooters in lacrosse). How long does it take until it hits the goal?

2. Relevant equations

Conversions:

15yd (0.91m) = 13.72m

96mi/h(1609.34m)(3600s) = 5.56x10^{8}m/s

d = v_{i}t + 1/2gt^{2}

3. The attempt at a solution

If this is how it is calculated on Earth...

d = v_{i}t + 1/2gt^{2}

13.72 = (5.56x108)t + 0.5(-9.81) t^{2}

-4.91t^{2}+ 5.56x108x -13.72 = 0

t = 2.47s

What the hell happens if the gravity is zero? I can't just put in 0 instead of -9.81 can I? From what I recall the whole formula doesn't even work if its not on earth! The ball would go insanely fast! Need some clarification on this. How would I go about calculating this? Thanks!

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# Homework Help: Projectile Motion, Shooting a Ball in Zero Gravity. !

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