Neglecting air resistance, two different masses will fall at the same rate.
drop a brick and a feather in a vacuume, and beleive it or not they will hit the ground at the same time
with air resistance, it depends on the shape of the two masses. since they both have the same dimensions, i'd assume that the difference in weight will make little change in the rate of downward accelleration, especially over only 1.5 m
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