The acceleration of free-fall for a body near to the earth is constant. The acceleration is about 10 m/s2.
Motions of bodies falling without air-resistance (vacuum):
There is a constant (uniform) acceleration of 10 m/s2.
The direction of the object is downwards, towards the centre of the earth.
The acceleration does not depend on the masses or the weights of the objects. All objects increase their speed at the same time.
Motions of bodies falling under air-resistance:
Accelerates until air resistance is equal to the pull of gravity . It then continues to fall at a constant velocity which is known as terminal velocity
It can be observed that: 1. The velocity of the object increases with a large acceleration;
10
2. The velocity of the object continues to increase but with a smaller acceleration; 3. The velocity of the paper does not increase anymore but remains at a constant = terminal velocity reached, and acceleration is zero.