magnitude and direction velocity vector

label Physics
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Bill is playing soccer and kicks the ball from ground level with an initial speed of 20 m/s in a direction of 30 degrees above the horizon. g=10m/s^2.. What is the magnitude and direction of the velocity vector when the ball hits the ground

Apr 20th, 2015

vfh = vih * cos 30 = (20 sqrt of 3)  /2

vfv=vi *sin 30=10

vf=sqrt (vfh^2 +vfv^2)=20m/s

magnitude tan^-1(vfv/vfh)=30 degree

Apr 20th, 2015

That does not match the choices that I have. Choices are

a) mag 15.6 dir 50

b) mag 10 dir 180

c) mag 15.6 dir 130

d) mag 10 dir 0

Apr 20th, 2015

Sorry disreguard my post. That was for a different question

Apr 20th, 2015

ok, no problem

Apr 20th, 2015

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Apr 20th, 2015
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Apr 20th, 2015
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