Here's a breakdown of the velocity and acceleration of a rock thrown upwards:

Velocity:

* Initial Velocity (v_i): This is the velocity at which the rock leaves your hand. It's positive because it's directed upwards.

* As the rock goes up: Its velocity decreases due to gravity. It slows down until it reaches its highest point. At the highest point, the velocity momentarily becomes zero.

* As the rock falls back down: Its velocity increases again, but now it's negative because it's directed downwards.

Acceleration:

* Throughout the entire flight: The acceleration of the rock is constant and always directed downwards due to gravity. This acceleration is approximately 9.8 m/s² (or 32 ft/s²).

Key Points:

* Gravity: The force of gravity is the primary factor affecting the rock's motion. It constantly pulls the rock downwards, causing it to slow down on the way up and speed up on the way down.

* Ignoring Air Resistance: We're assuming that air resistance is negligible in this scenario. In reality, air resistance would play a role, making the rock's motion more complex.

Important Note: The specific values of velocity and acceleration will depend on the initial velocity at which the rock is thrown.