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An object is thrown vertically upward wi...

An object is thrown vertically upward with a speed of 30 m.`s^(-1)`.The velocity of the object half a second before it reaches the maximum height is

A

4.9m.`s^(-1)`

B

9.8m.`s^(-1)`

C

19.6m.`s^(-1)`

D

25m.`s^(-1)`

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