Question:
An iron sphere of mass $10 \mathrm{~kg}$ has the same diameter as an aluminium sphere of mass is $3.5 \mathrm{~kg}$. Both spheres are dropped simultaneously from a tower.
When they are $10 \mathrm{~m}$ above the ground, they have the same
(a) acceleration
(b) momenta
(c) potential energy
(d) kinetic energy.
Solution:
(a). Freely falling bodies moves with constant acceleration.