For a machine to be of the self-locking type, its efficiency should be (a) (W=m P-c) (b)

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For a machine to be of the self-locking type, its efficiency should be

(a) \(W=m P-c\)

(b) \(W=m P+c\)

(c) \(P=m W-c\)

(d) \(P=m W+c\)

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