Answer:
c
Explanation:
the moon moves around earth
Answer:
<em>Choice: c. 6sec</em>
Explanation:
<u>Horizontal Launch
</u>
When an object is thrown horizontally with a speed (v) from a height (h), it describes a curved path ruled by gravity until it finally hits the ground.
The horizontal component of the velocity is always constant because no acceleration exists in that direction, thus:

The vertical component of the velocity changes in time because gravity makes the object fall at increasing speed given by:

Where 
To calculate the time the object takes to hit the ground, we use the same formula as for free-fall, since the time does not depend on the initial speed:

The marble rolls the edge of the table at a height of h=180 m, thus:


t = 6 sec
Choice: c. 6sec
Mass doesn't change, no matter where you take it.
Your first impression of ' 0 ' is totally correct.
Explanation:
The speed of the red car, relative to the blue car, is:
v = 75 m/s − 50 m/s
v = 25 m/s
About 21c because it also depends on the weather outside