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orangem
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Homework Statement
Need Help
I have been trying to solve this problem for a while now. I know the quadratic formula has to be used in order to solve this problem but I am having trouble getting started.
Question
A soccer ball is kicked from the ground level at an angle, such that the wall is hit at (point C) 1.9 seconds later. Point C (the wall) is 5.7m above the ground and the wall is 30m from where the ball is kicked. Ignore the effect of air resistance. Determine the magnitude and direction of initial velocity. How high the ball goes (point B, the highest point) the magnitude and direction of the velocity at the point of impact with the wall.
Unknown:
Voy-not given
Vox-not given
Vmag-not given
Angle -not given
Distance to point B-not given
Time to point B-not given
Time from point B to wall-not given
Distance from point B to wall not given
Known:
total time 1.9 sec
Height of wall where soccer ball hits 5.7m
Displacement -30m
ay=-9.8
ax=0
Vox=Vx
At Part B:
Vy = 0
Homework Equations
Vf=Vo+at
DeltaX=V(T)+ .5(at)
Vf^2=Vo^2=2(at)
ax2 + bx + c = 0
The Attempt at a Solution
I am not sure which formula to use since there are so many unknowns. I was thinking about using the distance formula just to part B and use the quad formula to solve to the two times but the distance to part B is not given.
Or should I use the third equation and say the final velocity is zero?
Is this how to get the Angle:
Triangle
30m, 5.7m, and X as the hypothenuse.
30^2+5.7^2=X^2
X= 30.5
Angle= arc Tan (5.7/30.5)= 10.75
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