Answer:
a. They both accelerate at the same rate but the forces are different because their masses are different
Explanation:
Firstly, as both the balls are falling under the action of gravity, the acceleration of both ball would be constant and equal to acceleration due to gravity (9.8 m/s2). However, the velocity of the objects falling under the action of gravity keep changing.
Secondly, the forces on object can be found by using formula:
[tex]F = ma[/tex]
[tex]here, a = g = 9,8 m/s^{2} \\so, F = m g[/tex]
Since, both balls are of different material their masses are different. Hence, the forces acting on both balls will be different.