... J532m)(3.80N)140( b) J315)25sin(m)(3.80)sm(9.80kg)0.20(2 c) The normal force does no work. d)J20325cosm)(3.80)sm(9.80kg)(20.0)30.0(cos2kkk θmgsμnsμsfWf e) J15J203J315J532 ... v,s.m3.9m)1050.2(3kg)(0.243kg)053.0(m)N3200(32xMmkvd) Algebraically,J40.0 )31( )21(2122mMkxmv andJ.60.0 )31( )21(6122MmkxMv6.68: From Eq. (6.7), with 01x,423322220 ... .J7.19s)/m256)(kg00.6)(2/1(2212 KKKW6.72: In Eq. (6.14), dxdl and 0 .31 is constant, and so.J39.30.31cos)m/N00.5(coscosm50.1m00.1222121 dxxdxFdlFWPPxxThe...