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A packet is dropped from a balloon risin...

A packet is dropped from a balloon rising up with uniform velocity `9.8 "ms"^(-1)`. If the balloon is at a height of 39.2 m from the ground at the time of dropping the stone, the stone reaches the ground after

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`s= ut+(1"/"2)at^(2), -39.2= 9.8xx t -(1"/"2)(9.8)xx t^(2)`
`t= 4s" or "-2s`.
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