Challenge: You throw a ball up into the air. It moves upward, reaches its high- est point, and then moves back down toward your hand. Assuming that upward is the positive direction, indicate in the table that follows whether the velocity is positive, zero, or negative during each of the three parts of the motion. Also in- dicate if the acceleration is positive, zero, or negative, (Hint: Remember that to find the acceleration, you must look at the change in velocity) Moving up At highest Moving after release point down Velocity Acceleration Question 3-23: In what ways is the motion of the ball similar to the motion of the cart that you observed in Activity 3-4? What causes the ball to accelerate