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A ball is thrown vertically upward with ...

A ball is thrown vertically upward with an initial velocity of `150m/s`. The ratio of velocity after `3 s` and `5 s` is `(x+1)/(x)`. The value of x is ____.
{take ,`g=10ms^(2)`}

A

`-5`

B

`10`

C

`5`

D

`6`

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