Question

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

Answer 1

Given: K.E. = 20 J
Mass, m = 100 g = 0.1 kg
Momentum, p = ?
K.E. = $\frac{1}{2}$m$v^2$ = $\frac{p^2}{2m}$

$p^2$ = 2m $\times$ K.E. = 2 $\times$ 0.1 $\times$ 20 = 4 kg.J = 4 (kg.m/s)²
p = $\sqrt{4}$
= 2 kg.m/s