Verified Answer :

As we know that K.E = 1/2 mv² so
 by arranging it 
K.E ×2÷6 = v²
now by putting values
v²=13.33 m²/s²
so
v= 3.65 m/s....

sairah

The formula to find kinetic energy is -

\(K.E. = \frac{1}{2}*m* v^{2}\)

Where,

\(m = mass\)

and

\(v = velocity\)

So, putting the values in the formula we get -

\(40 = \frac{1}{2} *6*v^{2}\)

\(\frac{40}{3} = v^{2}\)

\(\sqrt \frac{40}{3} = 3.6514 m/s\)