Question

Speed changes from 4m/s to 8 m/s of a 1 kg masss by how much force4

Answer 1

acceleration is 1m/s2

Answer 2

Initial kinetic energy =1/2×mv^2=1/2(1)16=8j

Final kinetic energy=1/2mv^2=1/2(1)64=32j

Workdone =(32-8)=24j

Here time is not given let time is t and assume constant acceleration during motion .

Therefore displacement =(Vintial+Vfinal)/t=12/t

Workdone=force×displacement

24=f×12/t

F=2t Newton (all unit in si system taken t is in second

Hope it helps u