Final answer:
The acceleration of the motorcycle is calculated to be -3.0 m/s². The negative sign signifies deceleration, indicating that the motorcycle is slowing down. This result is obtained by applying the formula for acceleration, considering the initial velocity of 18 m/s, final velocity of 0 m/s, and a time interval of 6.0 seconds.
Step-by-step explanation:
To find the acceleration of the motorcycle, we can use the formula: acceleration = (final velocity - initial velocity) / time. Given that the initial velocity is 18(m/s), the final velocity is 0.0(m/s), and the time is 6.0(s), we can substitute these values into the formula: acceleration = (0.0 - 18) / 6.0. Simplifying the equation gives acceleration = -3.0(m/s^2). Therefore, the acceleration of the motorcycle is -3.0(m/s^2). The negative sign indicates that the motorcycle is slowing down.