Ball thrown upward and another is dropped

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Homework Help Overview

The problem involves two balls: one thrown upward with an initial speed and another dropped from a height. The goal is to find the time at which both balls are at the same height, situated within the context of kinematics.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the initial conditions of both balls and the need to analyze their motions over time. There are suggestions to visualize the problem through drawings and to focus on one ball's motion at a time.

Discussion Status

The discussion is ongoing, with some participants offering guidance on visualizing the problem and considering the motion of individual balls. There is an acknowledgment of uncertainty regarding the appropriate formulas to use.

Contextual Notes

Participants express confusion about how to begin the problem and the effectiveness of their visual aids. There is a lack of clarity on which equations of motion are applicable in this scenario.

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A ball is thrown upward from the ground with a initial speed of 25 m/s; at the same instant, another ball is dropped from a building 15 m high. After how long will the balls be at the same height?

I'm not even sure how to start it so help!
 
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Draw a picture, with the applied forces.
 
First, consider just one ball.
Can you determine its motion as a function of time?
 
I'm not sure what formula to use to determine the time and I drew a pic but it didn't really help.
 

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