9) A 4.5 kg experimental cart undergoes an acceleration in a straight line (x-axis). The graph shows acceleration as a function of time. When is the net force equal to zero? A) at 0s and 6 s, B) at 0s and 2 s, C) at 2 s and 4 s, D) at 4 s and 6 s a, (m/s²) 10.0 5.0 O 2.0 4.0 6.0
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