A body of mass 5 kg initally at rest, is subjected to a force of 20N. What is the kinetic energy acquired by the body at the end of half minute?

Explanation

Here, `m=5kkg, u=0, F=20N`
`KE= ? ,t=(1)/(2) min=30s, a=(F)/(m)=(20)/(5)=4m//s^(2)`
`v=u+at=0+4xx30=120m//s`
`KE =(1)/(2)mv^(2)=(1)/(2)xx5(12)^(2)=3.6xx10^(4)J`