Homework Help: Projectiles (Physics)

Posted by Soph on Wednesday, October 3, 2012 at 5:40pm.

Joe is analyzing a video tape of a recent world cup soccer game and made a sketch. According to the diagram what is the launch velocity of the soccer ball?

The sketch shows 2 soccer players standing 17m apart. The player standing on the left kicks the ball and it makes an angle of 40 degrees. On the right, a player is standing in front of a goal post that is 2.2 m tall.

a=acceleration
d=distance
vf= final velocity
vi=initial velocity
t=time

I know i have to split it up into a y section and an x section.

So this is what i have so far

ay=9.8
ax=0
dx=17m
vix= missing velocity x cos40
viy= missing velocity x sin40

Projectiles (Physics) - Henry, Thursday, October 4, 2012 at 6:53pm
Dx = Vo^2*sin(2A)/g = 17 m.
Vi^2*sin(80)/9.8 = = 17
Vi^2*0.10049 = 17
Vi^2 = 169.2
Vi = 13 m/s @ 40o.

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