A 25000kg card moves south at 15m/s squared, 15m/s squared is the _____ of the car.

1.acceleratrion
2.displacement
3.velocity
4.speed

If this confuses you, you really need to learn the units of basic properties of motion.

m is distance
m/s is velocity (how fat the position changes)
m/s^2 is acceleration (how fast the velocity changes)