19. What would happen if two objects of
different weights were dropped from
the same height and at the same time
without air resistance?
A. The heavier object will reach the
ground first.
B. The lighter object will reach the
ground first.
C. The two objects will reach the
ground at the same time.
D. Both objects will not reach the
ground.
?
20. Why do astronauts float in the air when
they are many kilometers above the
Earth's surface?
A. Astronauts are trained to float in
the air.
B. Astronauts resist gravity.
C. The Earth's gravitational force is
less when an object is very far
from it.
D. There is plenty of water in outer
space where the astronauts could
float.​