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A man bailed out of a balloon. After som...

A man bailed out of a balloon. After some time the parachute opened up and he could land on the earth's surface with a retardation of 2.4`"m.s"^(-2)` and took 4 times that elapsed before the parachute opened. If the balloon was at a height of 398.4 m, how long was he airborne ?

Text Solution

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The correct Answer is:
20 s, 0.8 `"m.s"^(-1)`
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