Which statement accurately describes how the velocity of an object in free fall changes A. the distance it travels each second varies irregularly.
B the distance it travels each second is constant
C the distance it travels each second is increases at a constant rate.
D the distance it travels each second decreases at a constant rate.

yes they ca   is ur ansswerrr

1 a

2 d

3 a

4 c

explanation:

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

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