A child is walking in a straight line, which we shall call t…

A child is walking in a straight line, which we shall call the x axis, with the positive direction to the right. The figure below shows this child’s velocity as a function of time.      Which of the following statements about the child’s motion must be true?   1. Its acceleration is increasing. 2. Its speed is increasing from a to b. 3. Its speed is decreasing from a to b and increasing from b to c. 4. It is moving to the left between a and c. 5. It is moving to the left between a and b and to the right between b and c.