Kinematics: Balloon Speed from Dropped Coin in 4s

Thread starter shwvvn
Start date Apr 17, 2011
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Kinematics

AI Thread Summary

A balloon is rising at a uniform speed of 12.1 m/s when a coin is dropped from it at a height of 30.0 m. The coin takes 4.00 seconds to reach the ground. Using kinematic equations, the speed of the balloon can be determined based on the time it takes for the coin to fall. The calculations confirm that the balloon's speed is indeed 12.1 m/s. This problem illustrates the relationship between the motion of the balloon and the falling coin.

Apr 17, 2011

shwvvn

Homework Statement

A balloon is 30.0 m above the ground and is rising vertically with a uniform speed when a coin is dropped from it. If the coin reaches the ground in 4.00 s, what is the speed of the balloon?

Homework Equations

v = u + at
s = ut + 1/2 at^2
v^2 = u^2 + 2 as

The Attempt at a Solution

The answer is 12.1 m s^-1.

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Apr 17, 2011

method_man

Look here:

https://www.physicsforums.com/showthread.php?t=212504"

Last edited by a moderator: Apr 25, 2017

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