Do all objects fall at the same rate when dropped from a height?

[davidco2]

One of us said:

A metal ball and wooden ball regardless of weight and radius will hit the ground at the same time when dropped from any height (building)

Second thing...
is the speed of bullet exiting the barrel pointing upwards the same as it's speed when it hits the ground?

 

[Borek]

Answers depend on whether you ignore drag or not.

 

[davidco2]

it is not in vacuum... a real life situation with all influences included

 

[Borek]

And what are your answers?

 

[davidco2]

I just say billiard ball and a wooden ball with radius of 20m will not hit the ground at the same time, if dropped from 100m building (fall time will depend on size and weight of the object)
and also
bullet exiting barrel pointing 90degree upwards has the same speed as in moment hitting the ground (same level as gun)
Am I right or wrong ?

 

[Borek]

Yes, no.

Falling objects - if falling for long enough - usually obtain some maximal speed, which is a function of mass & drag. Initial speed of the bullet doesn't matter much, as long as the bullet got high enough.

 

[davidco2]

So it is YES that glass marble and cannonball will hit the ground at different moments?

 

[Borek]

Difference will be very small, but as they differ in density - yes, that's what we should expect.