Question

Derive an expression for the kinetic energy of the body of mass ‘m’ when placed at a height ‘h’from the earth’s surface ?

Answer 1

Answer:

in this case kinetic energy is 0J

Answer 2

This is the expression of kinetic energy.

Explanation:

Given that,

Mass of body = m

We need to calculate the kinetic energy

Using formula of work done

$W = F\cdot d$

Where, F = force

d = distance

Using equation of motion for distance

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

Put the value of d in the formula of work done

$W=ma\times(\dfrac{v^2-u^2}{2a})$

For initially, u =0

From work - energy theorem,

The work done is equal to the change in the kinetic energy of the object.

$K.E=\dfrac{1}{2}mv^2$

Hence, This is the expression of kinetic energy.

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Topic : kinetic energy

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