**(WORTH 100 POINTS An angle of incidence of 20° in water results in an angle of refraction of 15°.

1. Find the n of the second medium.

2. Find the speed of light in each medium

3. Repeat this question for an angle of refraction of 25°

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.

conservation of mass

mass before something happens = mass afterwards

c) power lifting, will be your answer.

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