Box 2 has zero acceleration as it is not changing its speed or direction, indicating that it could be either at rest or moving at a constant velocity in a straight line.
To describe the acceleration of box 2, we must examine the object's state of motion over time. If Box 2 is said to be 'not changing its speed' and also 'not changing its direction', we can infer that Box 2 is experiencing zero acceleration. This is because acceleration is defined as the change in velocity over time, and velocity includes both speed and direction.
Therefore, if box 2 is neither speeding up, slowing down, nor changing direction, it must have an acceleration of zero. The correct choice from the list provided would be 'Both b & c are correct.' This suggests that Box 2 could either be at rest or moving with a constant speed in a straight line, which are both conditions for zero acceleration.