A balloon is rising at 19 m/s when

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Homework Help Overview

The problem involves a balloon rising at a speed of 19 m/s and a passenger throwing a ball upwards at 21 m/s. The question seeks to determine the time it takes for the passenger to catch the ball after it is thrown.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to solve the problem using various methods but expresses uncertainty about the relevant equations. Some participants question the use of gravitational acceleration and its value in the context of the problem.

Discussion Status

The discussion is ongoing, with participants exploring different concepts related to the problem, including initial velocity and the principles of Galilean relativity. There is no explicit consensus on the approach to take, but some guidance on the principles involved has been shared.

Contextual Notes

There is mention of confusion regarding the relevant equations and the role of gravitational acceleration in the problem. The original poster has attempted the problem multiple times without arriving at a satisfactory answer.

imac
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Homework Statement


A balloon is rising at 19 m/s when its passenger throws a ball straight up at 21 m/s. How much later does the passenger catch the ball?

Homework Equations


Don't know relevant equations. except v(t)=volt-0.5(9.8)t^2 but I don't think that works.

The Attempt at a Solution


I've attempted this question 4 different ways and times. The answer isn't 4.0816 or 8.1632.

Please help, any help would be appreciated.
 
Last edited:
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v0t? and why is g and 9.8 in the equation?

are you familiar with Galilean relativity?
 
granpa said:
v0t? and why is g and 9.8 in the equation?

are you familiar with Galilean relativity?

Fixed it sorry, no... I'm not familiar with Galilean relativity.
 
velocity=initial velocity + acceleration * time
Galilean invariance or Galilean relativity is a principle of relativity which states that the fundamental laws of physics are the same in all inertial frames. Galileo Galilei first described this principle in 1632 in his Dialogue Concerning the Two Chief World Systems using the example of a ship traveling at constant speed, without rocking, on a smooth sea; any observer doing experiments below the deck would not be able to tell whether the ship was moving or stationary. Today one can make the same observations while traveling in an aeroplane with constant velocity. The fact that the Earth on which we stand orbits around the sun at approximately 30 km/s offers a somewhat more dramatic example.
 

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