Solve Kinematics Question for Ball Released at 15m/s and 10m Altitude

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Homework Help Overview

The problem involves a ball released from an altitude of 10 meters while traveling horizontally at a speed of 15 m/s. The main questions focus on determining how far in front of a target the ball should be released and the velocity of the ball at impact.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the initial conditions and question the adequacy of the provided information, particularly the absence of an angle. Some express uncertainty about the interpretation of the target's position.

Discussion Status

There are various interpretations of the problem, with some participants suggesting that the target is on the ground. A few have attempted calculations regarding the time of fall and horizontal distance but express concern over the accuracy of their methods and results. No consensus has been reached, and the discussion remains open-ended.

Contextual Notes

Participants note potential ambiguities in the problem statement, including the lack of an angle and the possibility of a typo in the worksheet. There is also a reminder to avoid posting complete solutions, especially if they may be incorrect.

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Homework Statement


A ball is released while traveling at 15m/s east at an altitude of 10m.
How many meters in front of the target must the ball be released?
What's the velocity of the ball at impact?

Homework Equations


d = vt
V[tex]_{}f[/tex] = V[tex]_{}i[/tex] + at
d = V[tex]_{}i[/tex]t + .5at[tex]^{}2[/tex]

The Attempt at a Solution


I know the origin must be 10m above ground level. However, after that I'm not sure what to do. I feel like there's not enough information for me to solve this. This could be a typo on the worksheet. Other problems I did like this gave angles so I'm a little confused without the angle.
Thanks in advance.
 
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I think although I may be wrong that question is asking that the target is a ground target, and that question is asking how far in front of the target the ball should be dropped from to make it land on the target.

Hazy question, I must admit.
 
That's what I'm thinking too, but I don't even know how to approach the question in order to solve it.
 
Initial velocity of the ball towards ground is zero. Using the third equation the time taken by the ball to reach the ground and the velocity with which it hits the ground can be calculated. t = 1.429s and velocity = 14m/s. During this time the ball is moving towards east at 15m/s. Therefore to hit the target, it must be at a distance 1.429x15 = 21.44 m.
The velocity with which it hits the ground is v = (15^2 + 14^2)^1/2 =20.52m/s
 
rl.bhat said:
Initial velocity of the ball towards ground is zero. Using the third equation the time taken by the ball to reach the ground and the velocity with which it hits the ground can be calculated. t = 1.429s and velocity = 14m/s. During this time the ball is moving towards east at 15m/s. Therefore to hit the target, it must be at a distance 1.429x15 = 21.44 m.
The velocity with which it hits the ground is v = (15^2 + 14^2)^1/2 =20.52m/s
Your help is much appreciated, but please don't post complete solutions, especially incorrect ones.
 

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