**Velocity at the highest point of motion:**

When an object is thrown upward, its velocity gradually decreases until it reaches the highest point of motion. At this point, the object momentarily comes to a complete stop before changing its direction and starting to fall back down. Therefore, the velocity of the object at the highest point is zero. This is because velocity is a vector quantity that includes both magnitude (speed) and direction. At the highest point, the object changes its direction from upward to downward, resulting in a velocity of zero.

**Acceleration at the highest point of motion:**

Acceleration is the rate of change of velocity with respect to time. It is also a vector quantity and can be positive or negative, depending on the direction of motion. In the case of an object thrown upward, the acceleration at the highest point is directed downward and is equal to the acceleration due to gravity (9.8 m/s^2 on Earth). This is because even though the object momentarily stops at the highest point, gravity continues to act on it, pulling it downward.

At the highest point, the object experiences a maximum acceleration due to gravity, which is often referred to as the "acceleration of free fall." This acceleration causes the object to decelerate while moving upward, eventually bringing it to a stop. As the object starts to fall downward, the acceleration due to gravity acts in the same direction as the motion, causing the object to accelerate in the downward direction.

In summary, at the highest point of motion when an object is thrown upward:
- Velocity is zero, indicating the object momentarily comes to a stop before changing its direction.
- Acceleration is directed downward and is equal to the acceleration due to gravity, causing the object to decelerate while moving upward and then accelerate downward.

its 0