A2.0 kg cart moving in a straight line hits a piece of modeling clay (1.0 kg) that is at rest. the clay sticks to the cart and both move to the left at 1.0 m/s. what was the initial velocity of the cart and in which direction? (remember to include - to indicate direction if necessary.) v= 1.5, 1.0, or 0.5 m/s to the right, orto the left