A balloon of gross weight W newton descends with an acceleration f m/s2. The weight that must be thrown out in order to give the balloon an equal upward acceleration will be:
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a
Wfg
b
2Wfg
c
2Wfg+f
d
W(g+f)f
answer is C.
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Detailed Solution
Let thrown out weight = w and upthrust = FuThen W−Fu=Wgfand Fu−(W−w)=W−wgfBy solving, w=2Wfg+f