The force exerted by a compression device is given by F(x) = kx (x - l) for 0 ≤ x ≤ where l is the maximum possible compression and k is a constant. The work required to compress the device a distanced is maximum when
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(b, c)
W = 
for W to be maximum
⇒ ⇒ x – l = 0
⇒ ⇒ x = l
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