Lost on Projectile motion problem

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Homework Help Overview

The problem involves projectile motion, specifically analyzing the trajectory of a marble thrown horizontally from a height. The marble's horizontal speed and the angle of its velocity upon impact with the ground are given, and the goal is to determine the height from which it was thrown.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the implications of ignoring air resistance and its effect on the marble's horizontal motion. There is an emphasis on understanding the constant horizontal velocity in the absence of air resistance.

Discussion Status

The discussion is currently focused on clarifying the assumptions regarding air resistance. Some participants have provided insights into the behavior of the marble under the stated conditions, but no consensus or resolution has been reached yet.

Contextual Notes

Participants are considering the impact of air resistance on the problem setup, which is a critical aspect of projectile motion analysis.

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Homework Statement



A marble is thrown horizontally with a speed of 12.0 m/s from the top of a building. When it strikes the ground, the marble has a velocity that makes an angle of 30.3 ° with the horizontal. From what height above the ground was the marble thrown?


-im lost at where to begin

Homework Equations





The Attempt at a Solution

 
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I think the key in this question is whether or not you are ignoring air resistance?

Jared
 
yes, while ignoring the air resistance
 
If there is no air resistance, there is nothing acting to decelerate the ball in the horizontal plane. The balls horizontal velocity is a constant 12m/s.
 

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