The acceleration of an object approaching Earth's surface is approximately 9.8 m/s², which is commonly denoted as g. This is known as the acceleration due to gravity.

Here's why:

* Gravity: Earth exerts a gravitational force on all objects near it. This force pulls objects towards the Earth's center.

* Acceleration: The force of gravity causes objects to accelerate, meaning their velocity changes over time.

* Constant Acceleration: Near the Earth's surface, the acceleration due to gravity is relatively constant, hence the value of 9.8 m/s².

Important Notes:

* This value of 9.8 m/s² is an approximation. The actual acceleration due to gravity varies slightly depending on factors like altitude and latitude.

* The acceleration due to gravity is always directed towards the Earth's center.

* This acceleration applies to objects in freefall, meaning they are only under the influence of gravity.

Let me know if you have any other questions!