Answer: -6 m/s^2
Explanation: The initial velocity (u) of the object is 30 m/s and the final velocity (v) is 0 m/s. The time taken (t) is 5 s.
The acceleration (a) can be calculated using the formula:
a = (v - u) / t
Substituting the values:
a = (0 - 30) / 5
a = -30 / 5
a = -6 m/s^2
Therefore, the object's acceleration is -6 m/s^2 (negative because it is decelerating or slowing down).