A 2.56 kg cart moving along a horizontal track in the positive x direction has a changing force exerted on it. The force exerted on the cart is plotted in the graph shown. Note that the friction between the cart and track is negligible.  a.-Calculate the work done in joules on the cart when it has reached a displacement of 27.9 cm along the track.  b.-If the cart is moving with a speed of 2.31 m/s when it has reached a displacement of 27.9 cm along the track, calculate how fast (in m/s) the cart was moving at the start (at displacement = 0).

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