Question

A body of momentum 10 kgms⁻¹ and mass 0.05 kg. Calculate the kinetic energy of body.

Answer 1

Momentum (p) = m × v

10 kgms⁻¹ = 0.05 kg × v

\[ \therefore\ v = \frac{10}{0.05} \]

= 200 ms⁻¹

\[ \therefore\ \text{K.E. of the body} = \frac{1}{2}\, mv^{2} \]

\[= \frac{1}{2} \times 0.05\ \mathrm{kg}\, (200\ \mathrm{m\,s^{-1}})^{2} \]

= 1000 J