SOLUTION: A) A baseball is hit 7 feet above the ground with an initial speed of 145ft/sec at an angle of 19 degrees. How far up a wall does it hit if the wall is 30 feet high and 400 feet aw

Algebra ->  Circles -> SOLUTION: A) A baseball is hit 7 feet above the ground with an initial speed of 145ft/sec at an angle of 19 degrees. How far up a wall does it hit if the wall is 30 feet high and 400 feet aw      Log On


   

Question 1191880: A) A baseball is hit 7 feet above the ground with an initial speed of 145ft/sec at an angle of 19 degrees. How far up a wall does it hit if the wall is 30 feet high and 400 feet away?
B). Suppose a HORIZONTAL wind is blowing in the same direction as the ball when the ball is hit. How strong does the wind need to be (in feet/sec) so that the ball hits the top of the wall on its way down?
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A) A baseball is hit 7 feet above the ground with an initial speed of 145ft/sec at an angle of 19 degrees. How far up a wall does it hit if the wall is 30 feet high and 400 feet away?
===============================
How was it hit 7 feet up?
-------------------
B). Suppose a HORIZONTAL wind is blowing in the same direction as the ball when the ball is hit. How strong does the wind need to be (in feet/sec) so that the ball hits the top of the wall on its way down?
------
Wind effects are complex. You have to consider temperature, humidity, and the change is the ball's speed.
This is beyond the scope of this site.
-----
PS Why is horizontal in all CAPS?

Answer by ikleyn(52785) About Me  (Show Source):
You can put this solution on YOUR website!
.

In part B) the person who created this problem, wants to lead you to thought to add the wind rate to the initial horizontal speed.


Do not make it: it is a WRONG conception.


This problem, as it is posed and offered to a school student, is CONCEPTUALLY WRONG.


The horizontal component of the ball' speed IS NOT the sum of the initial speed and the wind rate (!)


What to do ? - - - Simply IGNORE this part of the problem.

If you need to justify your decision before your teacher, simply refer to this my post.


Do not make wrong assignments - it is not the way to develop your skills (!)


The harm from solving such problems greatly exceeds the imaginary benefits.


//////////////

The post-note


I often see (practically every day) at this forum that some upcoming problems are created by persons who don't know a subject.