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The 12.5 kg cart is pushed with a force of 17.9 N. This gives it an acceleration of 17.9/12.5 = 1.432 m/s^2.
If the cart is initially at rest the distance moved by the cart in 3 seconds is (1/2)*1.432*3^2 = 6.444 m
The cart moves a distance of 6.444 m in 3 seconds.
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