Which of the following is true of Earth's gravity? A.
It pushes objects away from the Earth's surface without touching them.
B.
It only has an effect on the Moon and the Sun.
C.
It pulls objects toward the Earth's surface without touching them.
D.
It only has an effect on objects farther than ten meters from the E

c

Explanation:

Earth has a gravitational force which pulls objects towards the center of the earth.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

d) physical means can be used to separate the components of air.