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Energy of a body is defined as its capac...

Energy of a body is defined as its capacity of doing work.
A body of mass 5 kg initially at rest is subjected to a horizontal force of 20 N. What is the kinetic energy acquired by the body at the end of 10 s?

Text Solution

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`a=F/m=20/5=4ms^-2`
`v=u+at=0+4xx10=40ms^-1`
`KE=1/2mv^2=1/2xx5xx(40)^2=400J`
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