1) Classic rollercoasters are appropriately named because the cars do not have any engines or propulsion and coast along the track after they are pulled to the top of the first large
hill (Point A) by large chains connected to motors on the ground which gives them stored,
gravitational potential energy. Picture the first hill of 140 meters high with a steep drop
below all the way to ground level. Ignoring friction between the all the car wheels and the
track, as well as air resistance (drag), what would the velocity of the cars be at the bottom
of the hill (Point X).
B
140 m
A
- 120 m
95 m
с
80 m
D
х

answer; ///i believe that the correct answer is (45*) at a 45 degree check first good

colorectal cancer may also develop from areas of abnormal cells in the lining of the colon or rectum. this area of abnormal cells is called dysplasia and is more commonly seen in people with certain inflammatory diseases of the bowel such as crohn's disease or ulcerative colitis.

answer: good job it's all correct !

explanation:

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.