Yes, an object can have both changing velocity and acceleration simultaneously. In fact, acceleration is defined as the rate of change of velocity.
If the magnitude or direction of an object's velocity is changing, it means the object is experiencing acceleration. Acceleration can be caused by various factors, such as the application of a force or the influence of gravity.
For example, consider a car traveling in a straight line. If the car is initially moving at a constant velocity of 50 km/h and then the driver presses the accelerator to increase the speed, the car's velocity will change, and it will experience acceleration. The acceleration will be in the direction of the car's motion.
Similarly, if the car applies the brakes to slow down, the velocity will change in the opposite direction, and the car will experience acceleration in the opposite direction as well.
So, it's possible for an object to have both changing velocity and acceleration simultaneously, as acceleration is the cause of the change in velocity.