2. Sumin runs 50 meters from her house to the park down the street. She then keeps running in the same direction to her friend's house 150 meters from the park. She then turns around and goes back to the
park. What is Sumin's average velocity during her run if it takes her 2 minutes to complete?
a. 25 m/s
b. 2.92 m/s
C. 3.33 m/s
d. 0.417 m/s

Suppose you run 2 miles from your house to a friends house at a speed of 7 mi/hr. When the time comes to return home, you are tired and walk the same 2 miles at 3 mi/hr.

answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6

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.