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Answer:

16000j

a body is at rest

so intial velocity is zero

a force is exerted

which made it move

F=ma (where m is mass and is acceleration)

20=5a

a=4m/s²

now using Newton's first equation of motion

v=u+at

v=0+(4*20)

v=80m/s²

KE=1/2mv²

KE=1/2*5(80-0)²

KE=16000j

KE=16KJ

84

John

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