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A steel ball is dropped from the roof of...

A steel ball is dropped from the roof of a building. `A` man standing in front of a `1-m` high window in the building notes the the ball takes `0.1 s` to the fall from the top to the bottom of the window. The ball continues to fall and strikes the ground. On striking the ground, the ball gets rebounded with the same speed with which it hits the ground. If the ball reappears at the bottom of the window `2 s` after passing the bottom of the window on the way down, find the height of the building.

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The correct Answer is:
[21.004 m]
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