Calculate Car Acceleration: Slowing Down from 15 m/s

To calculate the acceleration, we can use the formula:

acceleration = (final velocity - initial velocity) / time

The initial velocity is given as 15 m/s, and the final velocity can be calculated by subtracting the 3 m/s deceleration from the initial velocity:

final velocity = 15 m/s - 3 m/s = 12 m/s

The time taken to slow down is given as 3 seconds. Plugging these values into the formula:

acceleration = (12 m/s - 15 m/s) / 3 s = -1 m/sﾲ

Therefore, the acceleration is -1 m/sﾲ. The negative sign indicates that the acceleration is in the opposite direction to the initial velocity.