An iron sphere of mass 30 kg has the same diameter as an aluminum sphere whose mass is 10.5 kg. The spheres are dropped simultaneously from a cliff. When they are 10 m from the ground, they have the same:
Given,
Mass of iron m = 30 kg
Mass of aluminium M = 10.5 kg
Height of iron h = 10m
Height of aluminum H = 10m
We know,
Kinetic energy = 
m v2
Potential energy = m × g × h
Momentum = mass × velocity
So kinetic energy, potential energy, kinetic energy and momentum depends of the mass of the body, they can’t be same for both spheres.
But acceleration due to gravity g = 10 ms-2 is same for all the objects at some height, irrespective of their mass and height.
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