Consider an object moving along a line with the given velocity v Assume t is time measured in seconds and velocities have units of m S a Determine when the motion is in the positive direction and when it is in the negative direction b Find the displacement over the given interval c Find the distance traveled over the given interval v t 212 16t 30 0 6 a When is the motion in the positive direction Select the correct choice and if necessary fill in the answer box to complete your choice OA The motion is in the positive direction for t values in the interval s Use a comma to separate answers as needed Type your answers in interval notation OB The motion is never in the positive direction