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A stone is dropped from the top of a tower which is 19.6 m high. What will be its velocity just before striking the ground?

A stone is dropped from the top of a tower which is 19.6 m high. What will be its velocity just before striking the ground? Take g = 9.8 m/s².

9.8 m/s

19.6 m/s

39.2 m/s

13.86 m/s

None of these

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