If we may ignore air resistance ... and we always do for calculations that
involve falling objects ... an object with 1200kg of mass accelerates at the
rate of about 9.8 meters per second-squared, if it's on or near the surface
of the Earth.
That acceleration is the same as that of a falling elephant, bowling ball, car,
rock, leaf, or feather, in the absence of air resistance. In the absence of air
resistance, acceleration in free fall doesn't depend on the mass, weight, size,
shape, color, temperature, gender identification, or national origin of the falling
objects. Without air resistance, all objects fall at the same rate, and ANY two
objects that are dropped from the same height at the same time hit the ground
at the same time.
