Question

Find the velocity of a body of mass $100g$ having a kinetic energy of $20J$.

Answer 1

Let $v$ be the velocity of object ,

Given that mass of object , $m=100g=\frac{100}{1000}kg=0.1kg$

& kinetic energy of object $=20J$

K.E = $\frac{1}{2}$ $m{v}^2$

$20=\frac{1}{2}\times 0.1v^2$

$⟹v^2=400$

$⟹v=20m/s$