Question

at what speed a body of mass 1kg will have a kinetic energy of 1 joule

Answer 1

ᴋ=ʜᴀʟꜰ ᴏꜰ ᴍᴠ^2 
1ᴊ=1/2*1*v^2
ᴠ^2=2 
ᴠ=√2=1.414ᴍ/ꜱ

Answer 2

$1 \div 2 \: mv {}^{2} = 1 \\ 1 \div 2 \: \times 1 \times v {}^{2} = 1 \\ v {}^{2} = 2 \\ v = \sqrt{2}$
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