After the free-fall time t of object A from a height, object B falls freely from the same position. Before both A and B fall to the ground, taking A as the reference object, the motion state of the B object is:
A. relatively static
B. straight line up
C. downward motion in a straight line
D. straight up
Answer:B
After the free-fall time t of object A from a height, object B falls freely from the same position. Before both A and B fall to the ground, taking A as the reference object, the motion state of the B object is:
A. relatively static B. straight line up C. downward motion in a straight line D. straight up