Question

Derive an expression for kinetic energy of an object of mass m moving with velocity v .



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Answer 1

Consider a body of mass "m" moving with an initial velocity "u".

A constant force "F" acts on it and the velocity changes to "v".

Let "s" be the distance covered and "a" be the constant acceleration

We know that

v² - u² = 2as

s = $\frac{v^{2} - u ^{2} }{2a}$

We know that ,

Work done = Force(F) × displacement (s)

F = ma

W = $ma ×\frac{v^{2} - u ^{2} }{2a}$

["a" gets cancelled ]

W = $m ×\frac{v^{2} - u ^{2} }{2}$

= $\frac{1 }{2}$

m[v² - u² ]

When , initial velocity , u = 0

W = $\frac{1 }{2}$

mv²

K.E = Work done

= $\frac{1 }{2}$

hope it helps u

Answer 2

Answer:

The process in which plants make their food by water,sunlight, glucose, minerals, chlorophyll is called photosynthesis.....

Explanation:

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