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Figure 1 Figure 2 Box A rests on Box B, which rests on a flat, rough floor, as shown in Figure 1. A string with negligible mass pulls on Box A and the boxes move together to the right with constant speed. The friction force between Box A and Box B has magnitude f,_g and the friction force between Box B and the floor has magnitude fr-p. Another block is placed on top of Block A, as shown in Figure 2, and the string again pulls the boxes so that they move together with a constant speed. How do fa_p and fp_r change between Figure 1 and Figure 27 fas fBF A Stays the same Stays the same B Stays the same Increases C Increases Stays the same D Increases Increases