The rate of change of momentum of the sledge is equal to
T−FT - FT−F
T−F−mgsinθT - F - mg \sin \thetaT−F−mgsinθ
T−mgsinθT - mg \sin \thetaT−mgsinθ
T−F+mgsinθT - F + mg \sin \thetaT−F+mgsinθ
