Question

Define kinetic energy and derive an expression for it

Answer 1

Answer:

Explanation:

Aperture of a lens is the effective diameter of its light transmitting area. Therefore, the brightness i.e. the intensity of the image formed by a lens which depends on the amount of light passing through the lens will vary as the square of the aperture of the lens. Ok thanks

Answer 2

$\huge \bf{ \pmb{ \blue{KINETIC} \: \red{ENERGY}}}$

✦ Kinetic Energy is the energy possessed by a body by virtue of its motion.

✦ It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.

FORMULA :-

1. $\boxed{ \large \cal{ \pmb{ \: \: \: \orange{K.E. = \frac{1}{2} \: mv²}}}}$

Here,

• K.E is the kinetic energy of the body
• "m" is the mass of the body
• "v" is the velocity.

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Example of KE :-

• Moving Car
• Flying Airplane
• Walking & Running