Kinematics: Balloon Speed from Dropped Coin in 4s

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SUMMARY

The problem discusses a scenario where a coin is dropped from a balloon that is 30.0 meters above the ground, rising at a uniform speed. The coin takes 4.00 seconds to reach the ground. Using the equations of motion, the speed of the balloon is determined to be 12.1 m/s. This conclusion is derived from applying the kinematic equations: v = u + at and s = ut + 1/2 at^2.

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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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