(Free-fall concepts)
Answer the following in detail without performing any numerical calculations.
(i) Define the term "free fall".
(ii) Explain why the acceleration of a freely falling body is taken as constant near the Earth’s surface.
(iii) A ball of mass 2kg and another of mass 1kg are released together from the same height in a vacuum. Which one will reach the ground first? Give reason.
(iv) Distinguish between the mass and the weight of a body while it is in free fall.