Answer:
The speed of light is not relative, it is always c no matter how fast or in what way the observer is moving
Explanation:
The speed of light. In a vacuum, it is by definition a universal constant of value 299,792,458 m / s (usually close to 3 · 108 m / s), or what is the same 9.46 · 1015 m / year; The second figure is used to define the interval called the light year. It is symbolized by the letter c, from the Latin celéritās (in Spanish celerity or rapidity), and is also known as the Einstein constant. [Citation needed] The value of the speed of light in a vacuum was officially included in the System International Units as a constant on October 21, 1983, thus passing the meter to be a unit derived from this constant. The speed through a medium other than the "vacuum" depends on its electrical permittivity, its magnetic permeability, and other electromagnetic characteristics. In material media, this speed is lower than "c" and is encoded in the index of refraction. In more subtle vacuum modifications, such as curved spaces, Casimir effect, thermal populations or presence of external fields, the speed of light depends on the energy density of that vacuum
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Answer:
The speed of the wind is 25 km/hr.
Explanation:
Let us call
the speed of the plane and
the speed of the wind. When the plane is flying against the wind, it covers the distance of 900-km in 2 hours (120 minutes); therefore;
(1). 
And when the plane is flying with the wind, it covers the same distance in 1 hour 48 minutes (108 minutes)
(2). 
From equation (1) we solve for
and get:
,
and by putting this into equation (2) we get:





or in km/hr this is

A) The kinetic energy of an object is given by:

where m is the mass of the object, and v its speed. For the lion in our problem, m=45 kg and v=14.2 m/s, so its kinetic energy is

b) the increase in gravitational potential energy of the lion is given by:

where g is the gravitational acceleration, and

is the increase in altitude of the lion. In this problem,

, so the increase in gravitational potential energy is

c) When the fox reaches the top of the tree, its gravitational potential energy is

As it jumps, its kinetic energy is

So the total mechanical energy of the fox as it jumps is
This is because, nuclear forces are short range forces.
The protons and neutrons are collectively called nucleons and they are found in the nucleus of an atom. These nucleons are held together by a strong attractive force called the nuclear force.
When atoms combine, they are held together by forces determined by electrons in the outermost shell. The influence of the nuclear force does not extend beyond the nucleus because they are short range forces.
Hence, we not consider the strong nuclear force when we describe the forces between atoms.
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