[填空题]
(I) How much work did the movers do (horizontally) pushing a 160-kg crw evv;af ( :m-u q*dka,+4vbugate 10fqdfo. 3-c g 9x*:fmkj.3 m across a rough floor without acceleration, if the effect xfo9mj f.kd-3 q*gc:five coefficient of friction was 0.50? J
