How long would it take an object to reach the floor if it dropped at a height of 0.5 and above the floor could you measure the freefall time of the object actor accurately with the stopwatch why

-- If it dropped from a height of 0.5 foot, then it would reach the floor
in 0.177 sec.  You could not measure the time accurately with a
stopwatch, because your own reaction time is the same order of
magnitude as the time you'd be trying to measure.

-- If it dropped from a height of 0.5 meter, then it would reach the floor
in 0.319 sec.  You could not measure the time accurately with a
stopwatch, because your own reaction time is the same order of
magnitude as the time you'd be trying to measure.

-- If it dropped from a height of 0.5 kilometer, then ... ignoring air
resistance ... it would reach the floor in 10.1 sec.  You could measure
that time quite accurately with a stopwatch.

2xy/9 is the answer to this problem