Question

A man is carrying a trolley of mass 6kg and having K.E. of 40 J . Calculate its velocity with which he is running .

Answer 1

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....

Answer 2

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 -

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

$\frac{40}{3} = v^{2}$

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