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A stone is thrown vertically upwards and...

A stone is thrown vertically upwards and the height x ft, reached by the stone in t seconds is given by `x=80t-16t^(2)` . The stone reaches the maximum height in

A

2 secs

B

2.5 secs

C

3secs

D

3.5 secs

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The correct Answer is:
C
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