Components of Projectile Motion

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Homework Help Overview

The problem involves analyzing the projectile motion of a ball thrown from a height of 19 meters, landing 98.2 meters away, with gravity set at 9.8 m/s². The original poster seeks to determine the initial velocity and the x and y components of the ball just before impact.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the initial assumptions regarding the direction of the initial velocity, with one suggesting that it should not be assumed to be purely horizontal. There is mention of separating the equations for the x and y directions and eliminating time from the equations.

Discussion Status

The discussion has seen some productive exchanges, with guidance offered on how to approach the problem by considering the components of motion separately. However, there is no explicit consensus on the solution, as the original poster indicates they have figured something out, but details are not provided.

Contextual Notes

There is a mention of a feature to mark the thread as solved, which appears to be non-functional, indicating a potential limitation in the forum's system for tracking resolved discussions.

Londoncalling
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1. The problem

A ball is thrown from a 19m building and hits the ground 98.2 m away. Gravity = 9.8 m/s2. Find the intial velocity as well as x and y components of the ball just before it hits the ground

Homework Equations


I found time=1.969149822.
 
Last edited:
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Londoncalling said:
A ball is thrown from a 19m building and hits the ground 98.2 m away. Gravity = 9.8 m/s2. Find the intial velocity as well as x and y components of the ball just before it hits the ground

I found time=1.969149822.

Hi Londoncalling! Welcome to PF! :wink:

No, you've assumed the initial velocity is horizontal.

Call the initial speed v, at an angle θ to the horizontal.

Then do the equations for the x and y directions (separately), and eliminate t. :smile:
 
Thanks I figured it out! Now if only I could figure out how to mark this thread as solved...
 
Londoncalling said:
Thanks I figured it out! Now if only I could figure out how to mark this thread as solved...

oh, that facility stopped working ages ago! :rolleyes: :smile: :-p
 

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