Final answer:
The correct unit for acceleration is m/s^2 (meters per second squared), which represents the rate at which velocity changes over time.
Step-by-step explanation:
The correct unit for acceleration is m/s2, which stands for meters per second squared. This unit expresses how much the velocity of an object changes in meters per second every second. Given the options, (a) m/sec2 is the only correct unit for acceleration. Options (b) kph, (c) m/sec, (d) mph, and (e) m2/sec do not represent units of acceleration. Velocity is a vector quantity, which means it includes both magnitude and direction, and its changes can result in acceleration, whether due to a change in speed or in direction.