Wednesday
July 23, 2014

Homework Help: Physics- Mechaincs

Posted by Genevieve on Friday, September 17, 2010 at 4:19pm.

A home run is hit such a way that the baseball
just clears a wall 27 m high located 147 m
from home plate. The ball is hit at an angle
of 37◦ to the horizontal, and air resistance is
negligible. Assume the ball is hit at a height
of 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.
---------------------------------

I tried using these equations
xf=xi+vxit+.5g^2
tan theta= vy/vx => vy= vx*tan theta
yf=vyt+.5gt^2

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
1. The problem statement, all variables and given/known data

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