- #1
gap0063
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1. A home run is hit such a way that the baseballjust clears a wall 27 m high located 147 mfrom home plate. The ball is hit at an angleof 37◦ to the horizontal, and air resistance isnegligible. Assume the ball is hit at a heightof 1 m above the ground.The acceleration of gravity is 9.8 m/s2 .What is the initial speed of the ball?Answer in units of m/s.
2. tried: xf=xi+vxit+.5g^2
tan theta= vy/vx => vy= vx*tan theta
yf=vyt+.5gt^2
3. with the above equation I got:
147= 0+ vxi(4.30407) + 4.9(4.30407)^2=13.0638 wrong
I got t= 4.30407 by pluging in vy= vx*tan theta into yf=vyt+.5gt^2
2. tried: xf=xi+vxit+.5g^2
tan theta= vy/vx => vy= vx*tan theta
yf=vyt+.5gt^2
3. with the above equation I got:
147= 0+ vxi(4.30407) + 4.9(4.30407)^2=13.0638 wrong
I got t= 4.30407 by pluging in vy= vx*tan theta into yf=vyt+.5gt^2