Question

A body of mass $100\text{g}$ has a kinetic energy of $5\text{J}$. Find its linear momentum.

• A. $8\text{kg-m/s}$
• B. $4\text{kg-m/s}$
• C. $2\text{kg-m/s}$
• D. $1\text{kg-m/s}$

Answer 1

The correct option is D $1\text{kg-m/s}$

We know the relation between kinetic energy and linear momentum,

$KE=\frac{p^2}{2m}$

$\Rightarrow p=\sqrt{2mKE}=\sqrt{2\times 0.1\times 5}=1\text{kg-m/s}$