Why do heavy and light objects fall at same speed?
Because Earth gives everything the exact same acceleration, objects with different masses will still hit the ground at the same time if they are dropped from the same height.
Given two objects of the same size but of different materials, the heavier (denser) object will fall faster because the drag and buoyancy forces will be the same for both, but the gravitational force will be greater for the heavier object.
Heavier objects hit the ground first as they have very less air resistance.
Since acceleration due to gravity is the same everywhere around the Earth and all objects experience the same acceleration as they fall, that's why heavier objects do not fall faster than lighter ones.
As such, all objects free fall at the same rate regardless of their mass. Because the 9.8 N/kg gravitational field at Earth's surface causes a 9.8 m/s/s acceleration of any object placed there, we often call this ratio the acceleration of gravity.
Heavy objects fall at the same rate (or speed) as light ones. The acceleration due to gravity is about 10 m/s2 everywhere around earth, so all objects experience the same acceleration when they fall.
The question is about the impact or momentum change. The impact of an object depends on mass and velocity. Since in this case, the heavier object has more mass, their impact or change in momentum requires more unbalanced force.
The heavy object will feel small changes to its speed (its acceleration is close to zero), while the light object will slow down a lot (its acceleration is a large negative number). In the end, the heavy object will travel farther, since it was less affected by air resistance.
There will be a resultant force which will be proportional to the mass of the object. Hence an object with greater mass feels greater force than the other one. So even if the slope is same for both objects, a massive object moves faster through the slope than a less mass object.
Because the downward force on an object is equal to its mass multiplied by g, heavier objects have a greater downward force. Heavier objects, however, also have more inertia, which means they resist moving more than lighter objects do, and so heaver objects need more force to get them going at the same rate.
Why do heavy and light object land at the same time?
Instead, they fall with a constant acceleration. That is to say that as they fall, the speed increases. For these two objects, they hit the ground at the same time because they both start from rest and both have the same acceleration.
There is an equal and opposite force on each of the two objects: they will both move. Now since the acceleration of each object is inversely proportional to the mass, the lighter object will move a bit faster. If you do the arithmetic you will find that they will meet at their common center of mass.
Gravity is the force that causes things to fall to earth. When you drop a ball (or anything) it falls down. Gravity causes everything to fall at the same speed. This is why balls that weigh different amounts hit the ground at the same time.