A hydrogen gas filled ballon having a mass of 25 g is released up in air . As the ballon descends , the gas starts leking from it with a unifrom velocity of `12 cm//s` and as a result the balloon shrinks completely in 5 s . Find the average force acting on the ballon .

Explanation

Here, `m = 25 g,u = 12 cm//s`
`v=0,t =5 s`
`F=ma=(m(v-u))/(t)=(25(0-12))/(5)`
`=-60 "dyne"`.