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12.A ball is thrown vertically upwards w...

12.A ball is thrown vertically upwards with speed `u`. If it experiences a constant air resistance force of magnitude `f`,then the speed with which ball strikes the ground,(weight of ball is `w` ) is
(1) `v=u((w+f)/(w-f))^(1/2),`
(2) `v=u(((w-f))/((w+f)))^(1/2)`
(3) `v=u((2(w+f))/((w-f)))^(1/2)`
(4) `v=u(((w+f))/(2(w-f)))^(1/2)`

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