Consider two identical objects released from rest high above the surface of the earth (neglect air resistance for this question). In Case 1 we release an object from a height above the surface of the earth equal to 1 earth radius, and we measure its kinetic energy just before it hits the earth to be K1.
In Case 2 we release an object from a height above the surface of the earth equal to 2 earth radii, and we measure its kinetic energy just before it hits the earth to be K2.
Compare the kinetic energy of the two objects just before they hit the surface of the earth.
K2 = 2 K1
K2 = 4 K1
K2 = (4/3) K1
K2 = (3/2) K1

The kinetic energies just before touching the ground are as follows;

Case 1

Case 2

The correct option is;

K2 = (4/3) K1

Explanation:

The work done is given by the relation;

For case 1

Where for case 1 we have:

G = Gravitational constant = 6.67408 × 10⁻¹¹ m³/(kg·s²)

r₂ = Radius of the Earth

r₁ = 2 × Radius of the Earth = 2 × r₂

Hence;

For case 2 we have:

G = Gravitational constant = 6.67408 × 10⁻¹¹ m³/(kg·s²)

r₂ = Radius of the Earth

r₁ = 3 × Radius of the Earth = 2 × r₂

Hence;

Therefore;

Hence;

K2 = (4/3) × K1.

they are non-matter

explanation:

they are non-matter. basically, any type of energy or any abstract concept is an example of something that does not matter. other examples include dreams, magnetism, radio, and hate

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia