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[SOLVED] Projectile Motion and Tennis
A tennis player hits a ball 2.0 m above the ground. The ball leaves his racquet with a speed of 20.0 m/s at and angle of 5 degrees above the horizontal. The horizontal distance to the net is 7.0 m, and the net is 1.0 m high. Does the ball clear the net? If so, by how much? If not, by how much does it miss?
VFx=VIx
X=VIx(T)
VFy=VIy+Ay(T)
Y=VIy(T)+.5Ay(T^2)
VFy^2=VIy^2+2A(Y)
I took:
Y=VIy(T)+.5Ay(T^2)
-1=1.74t-4.9t^2
0=1.74t-4.9t^2+1
t=.6629
I then did:
X=VIx(T)
X=19.92(T)
X=13.21m
The answer in the book is yes the ball cleared the net by 1.01m. If the distance to the net is 7m and I'm getting 13.21m, then my answer shows that the ball cleared the net by far more than 1.01m. Please, what am I doing wrong?
Homework Statement
A tennis player hits a ball 2.0 m above the ground. The ball leaves his racquet with a speed of 20.0 m/s at and angle of 5 degrees above the horizontal. The horizontal distance to the net is 7.0 m, and the net is 1.0 m high. Does the ball clear the net? If so, by how much? If not, by how much does it miss?
Homework Equations
VFx=VIx
X=VIx(T)
VFy=VIy+Ay(T)
Y=VIy(T)+.5Ay(T^2)
VFy^2=VIy^2+2A(Y)
The Attempt at a Solution
I took:
Y=VIy(T)+.5Ay(T^2)
-1=1.74t-4.9t^2
0=1.74t-4.9t^2+1
t=.6629
I then did:
X=VIx(T)
X=19.92(T)
X=13.21m
The answer in the book is yes the ball cleared the net by 1.01m. If the distance to the net is 7m and I'm getting 13.21m, then my answer shows that the ball cleared the net by far more than 1.01m. Please, what am I doing wrong?