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Q.

A packet is released from a balloon which is rnoving upward when the balloon is at a height 200 m above ground. The packet reaches the ground in 8 sec. Speed of the balloon when the packet is released, is: (take g = 10 m/s)2

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a

18 m/s

b

15 m/s

c

12 m/s

d

9 m/s

answer is B.

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Detailed Solution

By using s=ut+12at2 we have - 200=u(8)+12(-10)(8)2u=15 m/s
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