Question

Why do all objects hit with the same velocity (ignoring air resistance) if dropped from the same height?

Answer 1

the answer to this question  is A because If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time if they are dropped simultaneously from the same height. ... In air, a feather and a ball do not fall at the same rate.

Answer 2

Answer: C)Acceleration due to gravity affects all bodies the same since it depends primarily on the gravity of the planet, not on the object being dropped.

       

Explanation:

Using equation of motion,

$v^{2}=u^{2}+2gh$

where v= final velocity , u= initial velocity , h= height from where object is dropped ,acceleration due to gravity , $g=\frac{GM}{R^{2}}$

G= universal gravitational constant, M=mass of planet , R= radius of planet

Therefore g depends on mass and radius of planet .

=>If all objects are dropped from same height with zero initial speed the final speed depends only on acceleration due to gravity which is a property of planet taken into consideration and does not depend on the object.

For example if a piece of paper and a heavy stone are dropped from the same height with zero initial speed then both objects will have same final speed .