A feather and a hammer are in free fall when...
A. gravity and air resistance act on them.
B. air resistance is the only force acting on them
C. gravity is the only force acting on them.
D. weight is the only force acting on them.
A. gravity and air resistance act on them.
B. air resistance is the only force acting on them
C. gravity is the only force acting on them.
D. weight is the only force acting on them.