What do you mean by workless force?

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Solution

$D e a r s t u d e n t, W o r k d o n e = F s \cos θ f = f o r c e s = d i s p l a c e m e n t θ = a n g l e b e t w e e n f o r c e a n d d i s p l a c e m e n t i f d i s p l a c e m e n t o f t h e p o i n t o f a c t i o n o f t h e f o r c e i s p e r p e n d i c u l a r i . e ., θ = 90 °, t h e n W = F s \cos 90 ° = 0 . T h i s i s c a l l e d w o r k l e s s f o r c e . R e g a r d s$

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