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A stone is projected vertically up from ...

A stone is projected vertically up from the ground with velocity `40 ms^(-1)` . The interval of time between the two instants at which the stone is at a height of 60 m above the ground is `(g = 10 "ms"^(-2))`

A

4 s

B

6 s

C

8 s

D

12 s

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The correct Answer is:
A
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