Question

A body of mass 1kg has kinetic energy 2J. Find the velocity of the body
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Answer 1

Explanation:

k =1/2 mv^2

2 =1/2 ×1×v^2

4=v^2

so v=2 m/s

Answer 2

Given ,

Mass of the body = 1 kg

Kinetic energy = 2 Joule

We know ,

Kinetic energy of an body is given by :

$\sf \red{ \fbox{ \fbox{Kinetic \: energy = \frac{1}{2}m {(v)}^{2} }}}$

$\sf \implies 2 = \frac{1}{2} \times 1 \times {(v)}^{2} \\ \\ \sf \implies 2 = \frac{{(v)}^{2} }{2} \\ \\ \sf \implies {(v)}^{2} = 4 \\ \\ \sf \implies v = 2 \: \: m/s$

Therefore , the required velocity of the body is 2 m/s