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Free downwared motion of body is stopped...

Free downwared motion of body is stopped in 1 s on application of an upward force when the body has fallen through 10 m. Another force would have stopped the body in 2 s. find the ration between the two forces.
(g = 9.8 `m cdot s^(-2)` )

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The correct Answer is:
`17 : 12`
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