No, decreasing speed does not necessarily mean increasing acceleration. Speed and acceleration are two different concepts in physics.
Speed refers to the rate at which an object covers a certain distance. It is a scalar quantity and is typically measured in units like meters per second (m/s) or miles per hour (mph).
Acceleration, on the other hand, refers to the rate at which an object's velocity changes over time. It is a vector quantity and is typically measured in units like meters per second squared (m/s²) or miles per hour per second (mph/s). Acceleration can be positive, negative, or zero, depending on the direction and magnitude of the change in velocity.
If an object is slowing down, it means its speed is decreasing. This can happen when the acceleration is negative (opposite in direction to the velocity). However, it's important to note that acceleration can be positive (speeding up), negative (slowing down), or zero (constant speed or no change in velocity).
So, decreasing speed could be a result of a negative acceleration, but it could also be due to other factors like friction or drag. It's the combination of forces acting on an object that determines its acceleration and, consequently, changes in speed.