A ball is dropped from a height ℎ to the ground. If the coefficient of restitution is 𝑒, the time required for the ball to stop bouncing is proportional to: 

1
\( \frac{2+e}{1-e}\)
2
\( \frac{1+e}{1-e}\)
3
\( \frac{1-e}{1+e}\)
4
\( \frac{2-e}{1+e} \)

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