A student is investigating acceleration and force. The student rolls five balls of different masses and records her observations in the table shown.
Acceleration (m/s)
10
Ball
1
2
3
Mass (kg) Force (N)
5
50
10
100
15
150
20
200
25
250
10
10
w
4
10
10
5
What claim can the student make using this data?
The acceleration of an object decreases as the mass of an object increases.
The acceleration of an object is dependent on its mass.
The amount of force required to accelerate an object is proportional to its mass.
The mass of an object is directly proportional to its acceleration.

  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-