Here's why:
* Gravity is a force that pulls objects towards the center of the Earth. This force acts on all objects with mass.
* Acceleration is the rate of change of velocity. Since gravity always pulls downwards, the acceleration it causes will also always be downwards.
In upward motion:
* An object thrown upwards initially has an upward velocity.
* However, gravity acts on the object, causing it to slow down.
* This means the acceleration due to gravity is in the opposite direction to the object's velocity (downwards).
In downward motion:
* An object falling downwards has a downward velocity.
* Gravity acts on the object, causing it to speed up.
* The acceleration due to gravity is in the same direction as the object's velocity (downwards).
Important Note: While the direction of acceleration due to gravity is always downwards, the direction of the object's velocity can be either upwards or downwards.
