How Fast Was the Ball Thrown in This Projectile Motion Problem?

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Homework Help Overview

The problem involves a projectile motion scenario where a ball is thrown at an angle of 30 degrees and lands on a building 20 meters away, with a height difference of 5 meters from the throwing point. The objective is to determine the initial speed of the ball.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need to calculate both horizontal and vertical components of the motion. Some suggest using kinematic equations to find the initial velocity, while others express uncertainty about the completeness of the provided information.

Discussion Status

The discussion is ongoing, with participants exploring different approaches to the problem. Some guidance has been offered regarding the calculation of components, but there is no explicit consensus on the method to be used or the completeness of the information provided.

Contextual Notes

Participants note a potential lack of clarity regarding the initial conditions or assumptions necessary for solving the problem, indicating that some information may be perceived as missing.

Jordan_
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A ball is thrown upward at an angle 30 degrees above the horizontal and lands on the top edge of a building 20 m away. The top edge is 5m above the throwing point. How fast was the ball thrown?

ANS 20 m/s.

I just can't seem to get this. It looks like there is a piece of info missing but I know that's not the case. Any hints?
 
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there are enough values to solve this problem
you need to calculate horizontal component and vertical component
 
have you tried using v2= u2+2as ? I think rearranging that for u should work.
 
you've got to compute horizontal and vertical component because the ball was not thrown directly upward.. it was thrown at 30 degrees
 

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