The man of mass m1 = 90 kg and the woman of mass m2 = 77 kg are standing on the platform of mass m0 = 100 kg which moves with negligible friction and is initially at rest with s = 0. The woman holds still at x2 = 1 m. The man walks from the end of the platform at A for 1 meter in the direction shown (x1) : what displacement s results from this movement? The length of platform, l, is 5 meters.