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The maximum height is reached is 5s by a...

The maximum height is reached is `5s` by a stone thrown vertically upwards and moving under the equation `10s=10ut-49t^(2)`, where `s` is in metre and `t` is in second. The value of `u` is

A

`4.9m//sec`

B

`49m//sec`

C

`98m//sec`

D

None of these

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The correct Answer is:
B
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