Air-track gliders with masses 300 g, 400 g, and 200 g are lined up and held in place with lightweight springs compressed between them. All three are released at once. The 200 g glider flies off to the right while the 300 g glider goes left. Their position-versus-time graphs, as measured by motion detectors, are shown in FIGURE P11.44.
What are the direction (right or left) and speed of the 400 g glider that was in the middle?

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x (m) 1.0 200 g y = 0.53x + 0.42 0.8 - 0.6- Best-fit lines 0.4 0.2- y=-0.41x + 0.53 300 g - t (s) 1.00 0.0- 0.0 0.25 0.50 0.75 FIGURE P11.44