Question

Calculate the kinetic energy of a body of mass 100 g and having a momentum of 20 kgms⁻¹.

Answer 1

Convert the mass into kilograms: 100 g = 0.1 kg

Using \[ \text{K.E.} = \frac{p^{2}}{2m} \]

\[= \frac{(20)^{2}}{2\, (0.1)} \]

\[= \frac{400}{0.2} \]

= 2000 J

Therefore, the kinetic energy is 2000 J.