Aballon is released from the top of a platform that is 50 meters tall

Your question is not clear, mainly because you didn't ask one.  But it probably has
something to do with the subsequent motion of the balloon after it's released.

That's going to depend on ...

-- the material of which the balloon is made, especially its weight,
-- the substance with which the balloon is filled, especially its density,
-- the size of the balloon, especially its volume,
-- the temperature, pressure, humidity, and density of the air around the balloon,
-- the wind speed and direction in the neighborhood of the balloon,
-- whether the balloon is pushed, or simply let go of,
-- if pushed, then the direction and speed of the push.

Without any of this information, no answer to a question could be given,
even if there were a question.

For a 0.25 pfor b o.3pp (0.25+0.3)=0.28