•most of the galaxies in the universe are moving away from
earth. suppose a particular galaxy emits orange light with
a frequency of 5.00 * 1014 hz. if the galaxy is receding
from earth with a speed of 3325 km/s, what is the
frequency of the light when it reaches earth?
• a) 4.945 x 1014 hz
• b) 5.542 1012 hz
• c) 5.055 1014 hz

probably not if net force is zero

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.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000