(1) x 4.0 m/s x x=0 t=0 t=8.0 s 12 m/s x t=0 t v t v v-t x x=0 t x x=0 t=8.0 s x x =0 m (2) F k2 Q1, Q2 2 r F= Vt Vq I I= (1)
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