(Free-fall concepts)
Answer the following in detail without performing any numerical calculations.
a. (i) Define the term "free fall".
b. (ii) Explain why the acceleration of a freely falling body is taken as constant near the Earth’s surface.
c. (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.
d. (iv) Distinguish between the mass and the weight of a body while it is in free fall.