Question

The kinetic energy of a body of mass 2kg moving with a velocity of 2m/s is how many joule

Answer 1

Explanation:

Hence, the kinetic energy of a body is 0.01 Joule.

Answer 2

$\small \underline \bold{For \: a \: body}$-

$\large \underline \bold{Given}$:-

$\: \: \: \: \: \: \: \:$$\sf{mass \: (m) = 2 \: kg}$

$\: \: \: \:$$\sf{velocity \: (v) = 2 \: m/s}$

$\large \underline \bold{To \: Find}$:-

$\: \: \:$$\sf{kinetic \: energy \: of \: the \: body = ?}$

$\large \underline \bold{Using \: Formula}$:-

$\: \: \: \: \: \: \: \: \: \: \: \:$$\sf\boxed{\sf\pink{K.E. = \dfrac{1}{2}m v^{2}}}$

$\sf{Here \: ,}$

$\: \: \: \: \: \: \:$$\sf{K.E. = kinetic \: energy}$

$\: \: \: \: \: \: \: \: \: \: \: \:$$\sf{m = mass \: of \: the \: body}$

$\: \: \: \: \: \: \: \: \: \: \: \: \:$$\sf{v = velocity \: of \: the \: body}$

$\large \underline \bold{Solution}$:-

$\sf{On \: Putting \: the \: values \: in \: above \: formula \: -}$

$\: \: \: \: \: \: \: \:$$\sf{K.E = \dfrac{1}{2}\times 2\times (2)^{2}}$

$\: \: \: \: \: \: \:$$\sf{K.E. = \dfrac{1}{\cancel{2}}\times \cancel{2}\times 4}$

$\: \: \: \: \: \:$$\sf\boxed{\sf\red{K.E. = 4 \: joule}}$

$\small \bold{The \: kinetic \: energy \: of \: the \: body \: is \: 4 \: joule.}$

$\large \underline \bold{Extra \: related \: Fact}$:-

$\small \underline \bold{At \: starting}$-

$\: \: \: \: \: \:$$\sf{v = 0}$

$\sf{So \: ,}$

$\: \: \: \: \: \:$$\sf{K.E. = 0}$