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9. A body of mass 0.01 kg starts to move in a viscousliquid with initial velocity 5 m/s. If drag force is 10-3 N then find time after which velocity will becomem/s10(1) 49 sec(3) 149 sec(2) 100 sec(4) 200 seo

Answer»

the retardation due to drag force is = F/m = 10-³/0.01 = 0.1m/s²

now from Newton's equation V = u +at but due to retardation V= 0=> 0 = 5-(1/10)*t => t = 5*10 = 50 sec..

option A is correct..



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