Projectile launch at elevated height on angle

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Homework Help Overview

The problem involves a baseball player hitting a home run, with the ball's launch velocity and angle provided. The scenario includes the ball's height above ground at two points: when it leaves the bat and as it clears a fence. The objective is to determine the distance from home plate to the fence.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to calculate vertical and horizontal velocities and organizes their findings into separate headings for vertical and horizontal motion. Some participants question the calculations of time and displacement, suggesting a need for reevaluation. Others express confusion about the latter part of the original poster's approach.

Discussion Status

Participants are actively engaging with the problem, with some providing feedback on calculations and suggesting corrections. There is a mix of interpretations regarding the approach to finding the distance to the fence, and while some participants affirm the correctness of the time calculation, others are still exploring the necessary steps to reach a conclusion.

Contextual Notes

There are indications of potential misunderstandings regarding the displacement and time calculations, as well as the need for clarity on the problem setup. The original poster's method appears to be evolving, with some elements remaining uncertain.

rahrahrah1
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Homework Statement



a baseball player hits a home run. The ball's velocity as it leaves the bat is 45m/s at an angle of 36.9° above the horizontal. At the point of impact with the bat, the ball is 1 m above ground level, and as it clears the fence it is back down to 11 m above ground level. How far from home plate is the fence at this point?

Homework Equations


quadratic formula
linear motion equations
basic sin and cos
v=d/t

The Attempt at a Solution



so I started with finding the Vv and the Vh velocties
vh= 45cos6.9= 36.0
Vv= 45sin36.9 = 27.0

then I organized the information I had into two separate headings
Vv
v1: 27 m/s
v2:*27.4m/s
a: -9.8m/s
t:*5.5
d: -1m

and Vh
vave: 36m/s
t:*5.5
d:*198m

*I found the time using the quadratic formula and came up with 5.5 seconds
* I calculated the total distance the ball traveled using the formula d = v×t and got 198 m
* calulated the v2 for the Vv to be 27.4 m/s using linear motion equation
I'm thinking i need a colum for the fence distance now, however, this part is slightly iffy.

Vh for fence
vave:
t:T
d: 198-D

Vv for fence
v1:
v2:
a:-9.8m/s
t:T
d: -11m

At this point I've hit a dead end.
 
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The question states the ball is at 11m above the ground

So displacement is 10m.
Calculate your time again.(its not right)

After you have time
You will need to multiply it by v(h)*t to get d.(as you already did)

Thats all.thats your answer

I don't understand what (and why)you are doing in the latter part of your post.
 
Hmm, I always manage to overcomplicate an easy question. thanks, I calculated my time to be 5.1 secs.
 
Your answer appears correct.
 
rahrahrah1 said:
Hmm, I always manage to overcomplicate an easy question. thanks, I calculated my time to be 5.1 secs.


Always draw a diagram :-)
That shortens the problem in so many ways.

Your time is correct :-)
Now all that is left is to find the distance.
 

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