Certain force acting on 20kg mass changes its velocity 5m/s to 2m/s.calculatre the work done by force
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Answer...
According to the work energy theorem,
W = ∆KE
= ½m(v'² – v²)
where ,
v' = final velocity = 2m/s
v = initial velocity = 5m/s
=½ x 20 x (4-25)
=10 x -21
= -210 J ✓✓
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