What is the velocity of each cart in Figure 6.2 measured by an observer moving at \(-3.0 \mathrm{~mm} /\) frame in the Earth reference frame?

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Figure 6.2 Two identical carts on a low-friction track. The positions of the carts are measured with (a) a ruler affixed to the track and (b) a ruler moving along with cart 2. In the Earth reference frame, cart 1 is at rest and cart 2 is moving to the right. (a) Ruler is fixed to track (b) Ruler moves with cart 2 22.5 22.5 10 20 30 40 10 20 30 40 mm ruler A mm ruler B 3.6 22.5 18.9 10 201 '301 401 10 201 301 401 mm ruler A mm ruler B 7.2 22.5 0 15.3 201 '301 mm ruler A mm ruler B 10.8 22.5 0 11.7 10 201 30 401 10 20 301 40 mm ruler A mm ruler B 2 14.4 22.5 10 20 30 mm 0 8.1 201 30 40 ruler A mm ruler B