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The Answer Is 210 J
So
W= (K.E)f -(K.E)i
=1/2mv2^2 -1/2mv1^2
= 1/2m(v2_v1)^2
put values
W= 1/2×20(2^2_5^2)
W= 1/2×20×_21
W= 210J
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